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Photo: Jorge Franganillo, CC BY 2.0 via Wikimedia Commons
This is a triple structure: the church of the Monastery of Pantokrator built 1118, then a public church circa 1136 plus a chapel that served as a royal mausoleum. It became a mosque and medresse in Ottoman times, but without massive alteration so it's a prime example of middle-Byzantine architecture. It's nowadays again a mosque, photogenic by day or dusk but the area should be avoided at night.
Zeyrek Mosque or the Monastery of the Pantokrator, is a large mosque on the Fazilet Street in the Zeyrek district of Fatih in Istanbul, overlooking the Golden Horn. It is made up of two former Byzantine churches and a chapel joined together and represents the best example of Middle Byzantine architecture in Constantinople. After Hagia Sophia, it is the largest Byzantine religious edifice still standing in Istanbul.
© OpenStreetMap contributors
The original mosque was built between 1463-1470 by the Greek architect Atik Sinan, by order of Sultan Mehmet II the Conqueror, on the site of the former Church of the Holy Apostles, which had served as Byzantine Imperial burial place for a thousand years. The grand complex with eight medreses, a library, hospital, hospice, caravanserai, market, hamam, primary school and public soup kitchen was smashed again and again by earthquakes, and the present building is from 1771 to a different design. The interior is lavish, and outside is the ornate tomb of Mehmet II and his wife Gülbahar Hatun.
On top of a hill overlooking the Golden Horn, this is a magnificent mosque built by Sinan in the 1550s. It was centrepiece of a large külliye, a religious complex which included madrasas, a public kitchen and a hospital.. The small cemetery east has the mausoleums of Suleiman the Magnificent and of his wife Hurrem Sultan or Roxelana.
Commissioned by Süleyman the Magnificent and built by Mimar Sinan in 1550, at the east edge of Süleymaniye mosque complex. It had private cubicles for distinguished visitors such as the sultan, but was mostly a standard working-class bathhouse. It was restored in 2001 and is nowadays touristy. It's the only mixed hamam in Istanbul, but mixed sessions are only for couples and families.
Built in 1564 by Mimar Sinan for Rüstem Pasha, Grand Vizier of Suleiman the Magnificent, this small mosque has an interior covered by beautiful Iznik pottery, then at its zenith.
Turkish: Aya Yorgi, Greek: Agíou Geōrgíou
This is modest from the outside, as the Ottomans would not permit non-Muslim religious buildings to rival the mosques. The interior is lavish but its chief importance is as the senior Eastern Orthodox church. Their Patriarchate has been housed here since 1586 when they were ejected from Agia Sophia.
Imposing mosque built 1500/05. The other parts of the religious complex have found secular use.