The Bosphorus Bridge known officially as the 15 July Martyrs Bridge and unofficially as the First Bridge is one of the three suspension bridges spanning the Bosphorus strait (Turkish: Boğaziçi) in Istanbul, Turkey, thus connecting Europe and Asia (alongside Fatih Sultan Mehmet Bridge and Yavuz Sultan Selim Bridge). The bridge extends between Ortaköy (in Europe) and Beylerbeyi (in Asia).
It is a gravity-anchored suspension bridge with steeltowers and inclined hangers. The aerodynamicdeck hangs on steel cables. It is 1,560 m (5,118 ft)long with a deck width of 33.40 m (110 ft). The distance between the towers (main span) is 1,074 m (3,524 ft) and the total height of the towers is 165 m (541 ft). The clearance of the bridge from sea level is 64 m (210 ft).

Upon its completion in 1973, the Bosphorus Bridge had the fourth-longest suspension bridge span in the world, and the longest outside the United States (only the Verrazano-Narrows Bridge, Golden Gate Bridgeand Mackinac Bridge had a longer span in 1973).The Bosphorus Bridge remained the longest suspension bridge in Europe until the completion of the Humber Bridge in 1981, and the longest suspension bridge in Asia until the completion of the Fatih Sultan Mehmet Bridge (Second Bosphorus Bridge) in 1988 (which was surpassed by the Minami Bisan-Seto Bridge in 1989). Currently, the Bosphorus Bridge has the 33rd-longest suspension bridge spanin the world.

After a group of soldiers took control and partially closed off the bridge during the military coup d’état attempt on 15 July 2016, Prime Minister Binali Yıldırım announced on 25 July 2016 the decision of the Cabinet of Turkey that the bridge will be formally renamed as the 15 Temmuz Şehitler Köprüsü (July 15th Martyrs Bridge) in memory of those killed while resisting the attempted coup.
The idea of a bridge crossing the Bosphorus dates back to antiquity. For Emperor Darius the Great of the Achaemenid Empire (522 BC–485 BC), as recorded by the Greek writer Herodotus in his Histories, Mandrocles of Samos once engineered a pontoon bridge across the Bosphorus, linking Asia to Europe, enabling Darius to pursue the fleeing Scythians as well as position his army in the Balkans to overwhelm Macedon. Leonardo da Vinci proposed a parabolic arch bridge to Sultan Bayezid II in 1502 or 1503.The first modern project for a permanent bridge across the Bosphorus was proposed to Sultan Abdul Hamid II of the Ottoman Empire by the Bosphorus Railroad Company in 1900, which included a rail link between the continents.
The decision to build a bridge across the Bosphorus was taken in 1957 by Prime Minister Adnan Menderes. For the structural engineering work, a contract was signed with the British firm Freeman Fox & Partners in 1968. The bridge was designed by the British civil engineers Gilbert Roberts, William Brown and Michael Parsons, who also designed the Humber Bridge, Severn Bridge, and Forth Road Bridge. Construction started in February 1970 and ceremonies were attended by President Cevdet Sunay and Prime Minister Süleyman Demirel. The bridge was built by the Turkish firm Enka Construction & Industry Co. along with the co-contractors Cleveland Bridge & Engineering Company(England) and Hochtief AG (Germany). Thirty-five engineers and 400 men worked on the project.

The bridge was completed on 30 October 1973, one day after the 50th anniversary of the founding of the Republic of Turkey, and opened by President Fahri Korutürk and Prime Minister Naim Talu. The cost of the bridge was US$200 million ($1.13 billion in 2018 dollars).

Upon the bridge’s opening, much was made of its being the first bridge between Europe and Asia since the pontoon bridge of Xerxes in 480 BCE. That bridge, however, spanned the Hellespont (Dardanelles), some distance away from the Bosphorus, and was the second bridge after the above-mentioned bridge built by Emperor Darius I The Great across the Bosphorus in 513 BCE.
The bridge highway is eight lanes wide. Three standard lanes, one emergency lane and one pedestrian lane serve each direction. On weekday mornings, most commuter traffic flows westbound to Europe, so four of the six lanes run westbound and only two eastbound. Conversely, on weekday evenings, four lanes are dedicated to eastbound traffic and two lanes, to westbound traffic.

For the first three years, pedestrians could walk over the bridge, reaching it with elevators inside the towers on both sides. No pedestrians or commercial vehicles, such as trucks, are allowed to use the bridge today.

Today, around 180,000 vehicles pass daily in both directions, with almost 85% being cars. On 29 December 1997, the one-billionth vehicle passed the bridge. Fully loaded, the bridge sags about 90 cm (35 in) in the middle of the span.

Xerxes I’s inscription at Van, also known as the XV inscription, is a trilingual cuneiform inscription of the Achaemenid King Xerxes I (r. 486–465 BC). It is located on the southern slope of a mountain adjacent to the Van Fortress, near Lake Van in present-day Turkey. When inscribed it was located in the Achaemenid province of Armenia.[3]The inscription is inscribed on a smoothed section of the rock face near the fortress, approximately 20 metres (70 feet) above the ground. The niche was originally carved out by Xerxes’ father, King Darius(r. 522–486 BC), but he left the surface blank.
Placed high off the ground, in a region where there was very little literacy, the text had an additional meaning for those who were able to read, or to whom it was read aloud. In the opening sentence, Xerxes I mentions Ahuramazda, thus connecting himself to the religion of his father Darius, making use of language similar to that his father used for his imperial inscriptions in Iran proper. In this inscription, Xerxes I makes it clear that he reigns through the legitimation of his god Ahuramazda, the greatest god, the creator god. By mentioning his descent from Darius, Xerxes I asserts that he is the lawful ruler of the Achaemenid Empire. Xerxes I also shows that he is a good son and a good king, as he finished the work initiated by his father.According to Dusinberre: “The inscription practically reiterates the campaign against Greece that was responsible for Xerxes’ personal presence in Anatolia”. She thus concludes that the inscription at Van is far from “a mildly risible description of filling an empty space; rather, it serves as a highly visible and exceptionally powerful royal statement of empire and authority, situated in a spot charged with historical meaning and kingly significance”.
Amélie Kuhrt (2007) wonders why Darius chose this particular spot for an inscription: “The siting of the niche is in a prominent position, but the reason for Darius’ wish to leave an inscription here in particular is unknown. Could it have been connected with the many battles he fought in this region following the seizure of the throne?” Lori Khatchadourian (2016) states that the spot was specifically chosen to show that the area was now part of another power. By placing the inscription at the fortress of Tushpa (i.e. the Van Fortress), in the center of the former entity of Urartu, Darius and Xerxes “were making a claim on the former foundations of authority that had long prevailed in the region”, now remade as a province of the Achaemenid Empire.
The inscription at Van carries numerous messages.[9]Being one of only few attested Old Persianinscriptions outside Iran, it “overtly extends kingly reach into the “mountains and valleys of Anatolia” according to Elspeth R.M. Dusinberre (2013).According to Dusinberre, by making use of only “Mesopotamian and Persian languages”, the Achaemenid kings made a firm statement about that kingly reach: “This is a conquering overlord, a foreigner of power, who now exerts authority over the ancient lands of Urartu”. The fact that the inscription was not translated into the local language supports this, according to Dusinberre. There had been a long history of military conflict between Urartu and Assyria; the choice of these specific languages was an outright affirmation of Achaemenid control over Armenia, and of Achaemenid military superiority over Assyria. Dusinberre adds that the Old Persian text takes up twice as much room as the Babylonian and Elamite versions. Furthermore, the Old Persian text is “carved slightly larger” and with more “generous spacing between the characters”.According to Dusinberre: “This may be intended similarly to convey a comment about the superiority of the Achaemenid Persians over the ancient Mesopotamian peoples”. As the inscription is located high off the ground, and so is difficult to read from ground level, Dusinberre deems these small visual details important.

Lake Van the largest lake in Anatolia, lies in the far east of Turkey in the provinces of Van and Bitlis. It is a saline soda lake, receiving water from numerous small streams that descend from the surrounding mountains. Lake Van is one of the world’s largest endorheic lakes (having no outlet)—a volcanic eruption blocked the original outlet from the basin in prehistoric times. Although Lake Van has an altitude of 1,640 m (5,380 ft) in a region with harsh winters, its high salinity prevents most of it from freezing, and even the shallow northern section freezes only rarely.

Lake Van is 119 kilometres (74 mi) across at its widest point, averaging a depth of 171 metres (561 ft) with a maximum recorded depth of 451 metres (1,480 ft). The lake surface lies 1,640 metres (5,380 ft) above sea level and the shore length is 430 kilometres (270 mi). Lake Van has an area of 3,755 km2 (1,450 sq mi) and a volume of 607 cubic kilometres (146 cu mi).

The western portion of the lake is deepest, with a large basin deeper than 400 m (1,300 ft) lying northeast of Tatvan and south of Ahlat. The eastern arms of the lake are shallower. The Van-Ahtamar portion shelves gradually, with a maximum depth of about 250 m (820 ft) on its northwest side where it joins the rest of the lake. The Erciş arm is much shallower, mostly less than 50 m (160 ft), with a maximum depth of about 150 m (490 ft).

The lake water is strongly alkaline (pH 9.7–9.8) and rich in sodium carbonate and other salts, which are extracted by evaporation and used as detergents.

Lake Van is situated in the highest and largest regionof Turkey, which has a harsh continental climate. Average temperatures in July are between 22 and 25 °C, and in January between −3 °C to −12 °C. In particularly-cold winter nights the temperature reaches −30 °C. Lake Van mitigates the climate somewhat, so in the city of Van, on the shore of the lake, the average temperature in July is 22.5 °C, and in January −3.5 °C. The average annual rainfall in the basin of Lake Van, ranges from 400 to 700 mm.

The only fish known to live in the brackish water of Lake Van is Chalcalburnus tarichi or Pearl Mullet (Turkish: inci kefalı), a Cyprinid fish related to chuband dace, which is caught during the spring floods.[15]In May and June, these fish migrate from the lake to less alkaline water, spawning either near the mouths of the rivers feeding the lake or in the rivers themselves. After spawning season it returns to the lake.

103 species of phytoplankton have been recorded in the lake including cyanobacteria, flagellates, diatoms, green algae, and brown algae. 36 species of zooplankton have also been recorded including Rotatoria, Cladocera, and Copepoda in the lake.

In 1991, researchers reported the discovery of 40 m (130 ft) tall microbialites in Lake Van. These are solid towers on the lake bed created by mats of coccoid cyanobacteria (Pleurocapsa group) that create aragonite in combination with calcite precipitating out of the lake water.

The Lake Van region is the home of the rare Van Catbreed of cat, noted for among other things its unusual fascination with water, and is surrounded by fruit and grain-growing agricultural areas.

According to legend, the lake is home to a mysterious sea creature, known as the Lake Van Monster which is believed by some to lurk below the surface of the lake, described as being 30–40 ft long with brown scaly skin and with an elongated reptilian head and flippers, resembling an extinct mosasaurus or basilosaurus. Apart from some amateur photographs and videos, there is no physical evidence to prove its existence.

The Süleymaniye is an Ottoman imperial mosque located on the Third Hill of Istanbul, Turkey. The mosque was commissioned by Suleiman the Magnificent and designed by the imperial architect Mimar Sinan. An inscription specifies the foundation date as 1550 and the inauguration date as 1557. It is the second largest mosque in the city, the city’s largest Ottoman-era mosque, and one of the best-known sights of Istanbul.

The Süleymaniye Mosque, was built on the order of Sultan Süleyman (Süleyman the Magnificent), and designed by the imperial architect Mimar Sinan. The Arabic foundation inscription above the north portal of the mosque is carved in thuluth script on three marble panels. It gives a foundation date of 1550 and an inauguration date of 1557. In reality the planning of the mosque began before 1550 and parts of the complex were not completed until after 1557.

The design of the Süleymaniye also plays on Suleyman’s self-conscious representation of himself as a ‘second Solomon.’ It references the Dome of the Rock, which was built on the site of the Temple of Solomon, as well as Justinian’s boast upon the completion of the Hagia Sophia: “Solomon, I have surpassed thee!” The Süleymaniye, similar in magnificence to the preceding structures, asserts Suleyman’s historical importance. The structure is nevertheless smaller in size than its older archetype, the Hagia Sophia.

The Süleymaniye was damaged in the great fire of 1660 and was restored by Sultan Mehmed IV. Part of the dome collapsed during the earthquake of 1766. Subsequent repairs damaged what was left of the original decoration of Sinan (recent cleaning has shown that Sinan experimented first with blue, before making red the dominant color of the dome).

During World War I the courtyard was used as a weapons depot, and when some of the ammunition ignited, the mosque suffered another fire. Not until 1956 was it fully restored again.

The construction of the Haliç Metro Bridge in 2013 has irreparably altered the view of the mosque from north.

Hagia Sophia is the former Greek Orthodox Christian patriarchal cathedral, later an Ottoman imperial mosque and now a museum (Ayasofya Müzesi) in Istanbul, Turkey. Built in AD 360 at the beginning of the Middle Ages, it was famous in particular for its massive dome. It was the world’s largest building and an engineering marvel of its time. It is considered the epitome of Byzantine architecture and is said to have “changed the history of architecture”.
The Hagia Sophia construction consists of mostly masonry. The structure is composed of brick and mortar joints that are 1.5 times the width of the bricks. The mortar joints are composed of a combination of sand and minute ceramic pieces displaced very evenly throughout the mortar joints. This combination of sand and ceramic pieces could be considered to be the equivalent of modern concrete at the time.

From the date of its construction’s completion in 537 until 1453, it served as an Eastern Orthodox cathedraland the seat of the ecumenical patriarch of Constantinople, except between 1204 and 1261, when it was converted by the Fourth Crusaders to a Roman Catholic cathedral under the Latin Empire. The building was later converted into an Ottoman mosque from 29 May 1453 until 1931. It was then secularized and opened as a museum on 1 February 1935. It remained the world’s largest cathedral for nearly a thousand years, until Seville Cathedral was completed in 1520.

The current building was originally constructed as a church between 532 and 537 on the orders of the Byzantine emperor Justinian I and was the third Church of the Holy Wisdom to occupy the site, the prior one having been destroyed by rioters in the Nika riots. It was designed by the Greek geometers Isidore of Miletus and Anthemius of Tralles. The church was dedicated to the Wisdom of God, the Logos, the second person of the Trinity, its patronal feasttaking place on 25 December, the commemoration of the birth of the incarnation of the Logos in Christ.Although sometimes referred to as Sancta Sophia (as though it were named after Sophia the Martyr), sophia being the phonetic spelling in Latin of the Greek word for wisdom, its full name in Greek is Ναός της Αγίας του Θεού Σοφίας, Naos tēs Hagias tou Theou Sophias, “Shrine of the Holy Wisdom of God”. The church contained a large collection of relics and featured, among other things, a 15-metre (49 ft) silver iconostasis. The focal point of the Eastern Orthodox Church for nearly one thousand years, the building witnessed the excommunication of Patriarch Michael I Cerulariusofficially communicated by Humbert of Silva Candida, the papal envoy of Pope Leo IX in 1054, an act that is commonly considered the start of the East–West Schism.

In 1453, Constantinople was conquered by the Ottoman Empire under Mehmed the Conqueror, who ordered this main church of Orthodox Christianity converted into a mosque. Although some parts of the city of Constantinople had fallen into disrepair, the cathedral had been maintained with funds set aside for this purpose, and the Christian cathedral made a strong impression on the new Ottoman rulers who conceived its conversion. The bells, altar, iconostasis, and other relics were destroyed and the mosaics depicting Jesus, his Mother Mary, Christian saints, and angels were also destroyed or plastered over. Islamic features – such as the mihrab (a niche in the wall indicating the direction toward Mecca, for prayer), minbar (pulpit), and four minarets – were added. It remained a mosque until 1931 when it was closed to the public for four years. It was re-opened in 1935 as a museum by the Republic of Turkey. Hagia Sophia was, as of 2014, the second-most visited museum in Turkey, attracting almost 3.3 million visitors annually. According to data released by the Turkish Culture and Tourism Ministry, Hagia Sophia was Turkey’s most visited tourist attraction in 2015.

From its initial conversion until the construction of the nearby Sultan Ahmed Mosque, aka the Blue Mosque of Istanbul, in 1616, it was the principal mosque of Istanbul. The Byzantine architecture of the Hagia Sophia served as inspiration for many other Ottoman mosques, including the Blue Mosque, the Şehzade Mosque, the Süleymaniye Mosque, the Rüstem Pasha Mosque and the Kılıç Ali Pasha Complex.