section_path: Cityscape/Architecture
section_name: Architecture
paragraph_text: Architecture
  
  Istanbul is primarily known for its Byzantine and Ottoman architecture. Despite its development as a Turkish city since 1923, it contains many, Greek, Jewish, Roman, Islam, Christian, Judaism, and Muslim buildings.
  
  Neolithic settlement started near the Sea of Marmara, a peripheral to the formative zone of primary Neolithization. It is the spot of dispersal of Neolithic way of living in South-Еastern Europe and in the Black Sea. There are 14 excavated Neolithic sites in the region, making it possible to draw a picture on the emergence and on the consolidation of the Neolithic way of living at the near Europe. The sites might date back to c. 6400 BCE when a lot farmers came to the area. This was discovered during the construction of the Marmaray railway tunnel, it is the oldest known human settlement on the European side of the city. The oldest known human settlement on the Asian side is the Fikirtepe Mound near Kadıköy, with relics dating to the Chalcolithic period c. 5500 – c. 3500 BCE.
  
  There are numerous ancient monuments in the city. The most ancient is the Obelisk of Thutmose III (Obelisk of Theodosius). Built of red granite, 31 m (100 ft) high, it came from the Temple of Karnak in Luxor, and was erected there by Pharaoh Thutmose III (r. 1479 – 1425 BCE) to the south of the seventh pylon. The Roman emperor Constantius II (r. 337–361 CE–) had it and another obelisk transported along the Nile to Alexandria for commemorating his ventennalia or 20 years on the throne in 357. The other obelisk was erected on the spina of the Circus Maximus in Rome in the autumn of that year, and is now known as the Lateran Obelisk. The obelisk that would become the Obelisk of Theodosius remained in Alexandria until 390, when Theodosius I (r. 379–395) had it transported to Constantinople and put up on the spina of the Hippodrome there. When re-erected at the Hippodrome of Constantinople, the obelisk was mounted on a decorative base, with reliefs that depict Theodosius I and his courtiers. The lower part of the obelisk was damaged in antiquity, probably during its transport to Alexandria in 357 CE or during its re-erection at the Hippodrome of Constantinople in 390 CE. As a result, the current height of the obelisk is only 18.54 meters, or 25.6 meters if the base is included. Between the four corners of the obelisk and the pedestal are four bronze cubes, used in its transportation and re-erection.
  
  Next in age is the Serpent Column, from 479 BCE. It was brought from Delphi in 324 CE, during the reign of Constantine the Great, and also erected at the spina of the Hippodrome. It was originally part of an ancient Greek sacrificial tripod in Delphi that was erected to commemorate the Greeks who fought and defeated the Persian Empire at the Battle of Plataea in 479 BCE. The three serpent heads of the 8-meter (26 ft) high column remained intact until the end of the 17th century (one is on display at the nearby Istanbul Archaeology Museums).
  
  Built in porphyry and erected at the center of the Forum of Constantine in 330 CE to mark the founding of the new Roman capital, the Column of Constantine was originally adorned with a sculpture of the Roman emperor Constantine the Great depicted as the solar god Apollo on its top, which fell in 1106 and was later replaced by a cross during the reign of Byzantine emperor Manuel Komnenos (r. 1143–1180).
  
  There are traces of the Byzantine era throughout the city, from ancient churches that were built over early Christian meeting places like the Hagia Irene, the Chora Church, the Monastery of Stoudios, the Church of Sts. Sergius and Bacchus, the Church of Theotokos Pammakaristos, the Monastery of the Pantocrator, the Monastery of Christ Pantepoptes, the Hagia Theodosia, the Church of Theotokos Kyriotissa, the Monastery of Constantine Lips, the Church of Myrelaion, the Hagios Theodoros, etc.; to palaces like the Great Palace of Constantinople and its Mosaic Museum, the Palace of the Porphyrogenitus, Boukoleon Palace and Palace of Blachernae; and other public places and buildings like the Hippodrome, the Augustaion, the Basilica Cistern, Theodosius Cistern, Cistern of Philoxenos and Cistern of the Hebdomon, the Aqueduct of Valens, the Prison of Anemas, the Walls of Constantinople and the Porta Aurea (Golden Gate), among numerous others. The 4th century Harbor of Theodosius in Yenikapı, once the busiest port in Constantinople, was among the numerous archeological discoveries that took place during the excavations of the Marmaray tunnel.
  
  However, it is the Hagia Sophia that fully conveys the period of Constantinople as a city without parallel in Christendom. The Hagia Sophia, topped by a dome 31 meters (102 ft) in diameter over a square space defined by four arches, is the pinnacle of Byzantine architecture. The Hagia Sophia stood as the world's largest cathedral until it was converted into a mosque in the 15th century. The minarets date from that period. Because of its historical significance, it was reopened as a museum in 1935. However, it was re-converted into a mosque in July 2020.
  
  Over the next four centuries, the Ottomans transformed Istanbul's urban landscape with a vast building scheme that included the construction of towering mosques and ornate palaces. The Sultan Ahmed Mosque (Blue Mosque), another landmark of the city, faces the Hagia Sophia at Sultanahmet Square (Hippodrome of Constantinople). The Süleymaniye Mosque, built by Suleiman the Magnificent, was designed by his chief architect Mimar Sinan, the most illustrious of all Ottoman architects, who designed many of the city's renowned mosques and other types of public buildings and monuments.
  
  Among the oldest surviving examples of Ottoman architecture in Istanbul are the Anadoluhisarı and Rumelihisarı fortresses, which assisted the Ottomans during their siege of the city. Over the next four centuries, the Ottomans made an indelible impression on the skyline of Istanbul, building towering mosques and ornate palaces.
  
  Topkapı Palace, dating back to 1465, is the oldest seat of government surviving in Istanbul. Mehmed II built the original palace as his main residence and the seat of government. The present palace grew over the centuries as a series of additions enfolding four courtyards and blending neoclassical, rococo, and baroque architectural forms. In 1639, Murad IV made some of the most lavish additions, including the Baghdad Kiosk, to commemorate his conquest of Baghdad the previous year. Government meetings took place here until 1786, when the seat of government was moved to the Sublime Porte. After several hundred years of royal residence, it was abandoned in 1853 in favor of the baroque Dolmabahçe Palace. Topkapı Palace became public property following the abolition of monarchy in 1922. After extensive renovation, it became one of Turkey's first national museums in 1924.
  
  The imperial mosques include Fatih Mosque, Bayezid Mosque, Yavuz Selim Mosque, Süleymaniye Mosque, Sultan Ahmed Mosque (the Blue Mosque), and Yeni Mosque, all of which were built at the peak of the Ottoman Empire, in the 16th and 17th centuries. In the following centuries, and especially after the Tanzimat reforms, Ottoman architecture was supplanted by European styles. An example of which is the imperial Nuruosmaniye Mosque. Areas around İstiklal Avenue were filled with grand European embassies and rows of buildings in Neoclassical, Renaissance Revival and Art Nouveau styles, which went on to influence the architecture of a variety of structures in Beyoğlu—including churches, stores, and theaters—and official buildings such as Dolmabahçe Palace.