A neo-gothic anglican cathedral which would not be out of place in northwestern Europe, Crimean Memorial Church was built for the protestant community of the city by Britain in late 1800s
They have good art exhibits for free and sometimes have French films in the cinema
It was built by the Genoese on the city walls of Galata, then a western (Genoese/Venetian) stronghold beside eastern (Byzantine/Ottoman) Constantinople
Finding a quite large and still operating church on the edge of the main square of the largest city of a predominantly Muslim country may not be expected by everyone, but this is exactly the definition of the quite elaborate Hagia Triada
TheTopkapi Palace was the primary residence of the Ottoman Sultans for approximately 400 years of their 624-year reign
Pera Museum is a private museum with a large collection of Turkish Orientalist paintings, archaeological finds of Anatolian measurement units and tools used in Asia Minor since antiquity, and faiences of Kütahya
Although not at the size of Hagia Sophia, this is the largest church (still used for religious activities) in Turkey
A must see! One of the best, including a great collection of Sumerian tablets, pieces of the wall of Babylon and Roman marble statues
Hagia Irene, which you will notice to your left after entering the outer yard of Topkapi Palace, is one of few Byzantine-era cathedrals which was never converted to a mosque (though not used for religious purposes either during the Ottoman period), although access to the interior is not allowed unless you have a ticket to the classical music concerts sometimes taking place inside the building
A car-free downhill cobbled street just behind Hagia Sophia, with renovated (or totally re-built) traditional wooden houses two- or three-storeys tall typical of Ottoman era, leaning against the outer wall of Topkapi Palace grounds/Gülhane Park