Halki seminary

Built in the early 5th century as a monastery dedicated to Saint Andrew the Apostle, in 766 it was the burial place of Saint Andrew of Crete and was later re-dedicated to him. It was rebuilt in the late 9th century and again in the 13th, then around 1490 converted into a mosque. From the 16th century it was occupied by the Dervishes, when the legend arose that a chain hung to a cypress tree in the courtyard was a truth diviner. The chain was swung between rival witnesses and the one it hit was telling the truth. The cypress stump is still standing.

The Church of Theotokos Pammakaristos ("All-Blessed Mother of God") was built between the 11th and 12th centuries. The parekklesion or side-chapel was added maybe 1300, with rich mosaics. The main building became a mosque in 1591, named for Sultan Murad III's conquest (fetih, hence Fethiye) of Georgia and Azerbaijan: the interior was opened up, but the chapel was undisturbed and in modern times became a museum. In 2020 the entire building was proclaimed a mosque, and every scrap of Byzantine artistry was covered up, so now there's nothing worth seeing.

A resort on the Marmara coast. It's the westernmost part of Istanbul, between Çatalca and the province of Tekirdağ. There are some remnants of the Anastasian wall here, the scrappy ruins of a castle, an ancient cistern, the Piri Paşa Mosque, and Uzunköprü the long aqueduct.

Although not at the size of Hagia Sophia, this is the largest active church in Turkey. It’s directly on Istiklal St, but somewhat hidden from view by its yard portal. Catholic Masses in Italian, Turkish, and English (in different days of the week).

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.

If you are already in the area, it's worth considering to visit this waterside neo-Baroque manor, built in the 19th century for the countryside and hunting excursions of the Ottoman dynasty. The area, where the Göksu River flows into the Bosphorus, was known as "the Sweet Waters of Asia" by the pioneer European travellers of the epoch (as opposed to "the Sweet Waters of Europe", another contemporary elite recreational area on the other side of the city, where the Kağıthane and Alibeyköy Rivers empty into the Golden Horn).

A neighbourhood east of Şişli known for its Art Nouveau apartment buildings, the ground floors of many of which are upmarket restaurants, cafes, pubs, and garment stores lining the sidewalks. Nobel laureate Orhan Pamuk, well-known Turkish novelist, is a lifelong resident of the neighbourhood which formed the background of several of his novels.

A charming domed church built in 1880 at the side of Taksim Square, now uneasily contesting with Taksim Mosque for being the main landmark of the southern edge of the square.

The Golden Gate was the ceremonial entrance through the Theodosian city walls. After the Ottomans captured the city in 1453, Mehmed II needed a stronghold for his treasures and documents. The gate was therefore bricked up and the walls reinforced into a fortress, with valuables stored in its seven towers, hence yedi kule. In the following century the treasury moved to Topkapi Palace and the fort became a prison for high-level detainees - Osman II was strangled here in 1622. It remained in use until 1837, whereupon the Golden Gate was re-opened.

A former synagogue, the museum's exhibit details how the cultures mixed with and influenced each other in the past 500+ years since the Spanish expulsion.

A nice, organized museum with contemporary installations. It may be seen as overpriced given its small size. It also has a simple cafe.

Chora means countryside, and when built as a monastery in the 4th century it stood outside the Constantine walls; a century later, it was incorporated into the Theodosian walls. It was rebuilt in the 11th century then wrecked by an earthquake, so the structure and fabulous mosaics you see now are 14th century. When the church was converted to a mosque in 1500 the mosaics were plastered over, and only restored in 1958 when it became a museum. In 2020 it was again proclaimed a mosque but here (unlike Fethiye Mosque) they saw the sense and tourist income of preserving the mosaics. You need to work around prayer times.

A remarkable Bulgarian Orthodox church better known as Demir Kilise, "Iron Church", as it's a cast iron prefab. The Bulgarians split from the Greek Orthodox and established their own wooden church in 1870, which burned down. The ground was too weak for a masonry or concrete structure so they opted for cast iron. The sections were cast in Vienna, shipped here and assembled, to open in 1898. The church was renovated in 2018, but the archpatriarchate building across the street remains a gaunt shell.

A private museum with a large painting collection and archaeological collections of measurement units and tools used in Asia Minor since antiquity and faiences of Kütahya.

The building was erected as a Roman Catholic church in 1325 by the friars of the Dominican Order, near or above an earlier chapel dedicated to Saint Paul (Italian: San Paolo) in 1233. In 1299, the Dominican Friar Guillaume Bernard de Sévérac bought a house near the church, where he established a monastery with 12 friars. A new, much larger church was built near or above the chapel of San Paolo in 1325. Thereafter the church was officially dedicated to San Domenico. After the Fall of Constantinople, according to the Capitulations of the Ottoman Empire with the Republic of Genoa, the church, which by that time was known by the Turks under the name of Mesa Domenico, remained in Genoese hands, but between 1475 and 1478 it was transformed, with minor modifications, into a mosque by the Ottoman Sultan Mehmed II and became known as Galata Camii ("Galata Mosque") or Cami-i Kebir ("Great Mosque"). Towards the end of the century Sultan Bayezid II assigned the building to those Muslims of Spain (Andalusia) who had fled the Spanish Inquisition and migrated to Istanbul; hence the present name Arap Camii (Arab Mosque). Today, Arap Camii is the largest mosque on the Galata side of the Golden Horn. It is one of the most interesting mosques in the city due to its early Italian Gothic architectural style and church belfry, which has practically remained unaltered even after being converted into a minaret.

A contemporary art museum in a building converted from an old power plant: 1914-built and coal-fired, this was the oldest in Istanbul and the Ottoman Empire. Part of the plant was kept in almost exact original condition and now serves as the "Energy Museum".

A medieval citadel on the Bosphorus at the mouth of the Göksu creek. It was built in the late 14th century to control (polite word for "choke off") shipping along the Bosphorus, which narrows to 660 m at this point. It worked in tandem with Rumeli Citadel, built some 50 years later on the European bank. It fell into disrepair but was restored in the 1990s. You can't go in, but it's a pleasant setting; the entire village is named Anadolu Hisarı after the fort and has many traditional wooden houses (yalı). Ferries along the Bosphorus call here.