This red brick neo-Gothic church was originally founded by an Italian Franciscan about 200 years ago and was rebuilt in 1912. The architect was Giulio Mongeri, an Italian born in Istanbul. It is directed by Italian priests and is the largest functioning Roman Catholic sanctuary in Istanbul.

This is the Church of St. Gregory, the Illuminator and the oldest Armenian Church in Istanbul. According to old writings, Surp Sarkis Church was around as early as 1360. A new church was constructed in 1431 however it had to be demolished due to the widening the road between Tophane and Karaköy.

Although both buildings have unimpressive exteriors it includes a golden patriarchal throne believed to be from the Byzantine era, three very rare mosaic icons, a pillar accepted as the one on which the Christ was tied and whipped and coffins of three saints.

It is an impressive and astonishing slate-gray Neo-Gothic church near Haghia Yorgi in Fener. It was built in a waterside park on the Golden Horn in 1871 to celebrate the independence of Bulgaria. It is an all-iron church due to the soft characteristic of the ground.

The church gets its name from the illegitimate Byzantine Princess Mary who married Mongol Khan. After her husband’s assassination she returned to Constantinople and had a church built (1282) and lived there as a nun. The best mosaic of the church is the one describing Theodokos Pammakaristos.

This church was built in combination with the Dominican convent by the Genoese colony in the 1400s. It is one of the three surviving Medieval Latin churches in Galata and now serves the local Maltese community. Mass, everyday at 07:30, Sunday at 11:00 in Italian.

It is the chapel of the former French embassy and is situated in a beautiful garden in Beyoğlu with a view of the Bosphorus. It is the oldest established Latin Church (1581) in Istanbul. Sunday mass 11:00.

This is the only church built by Syriacs. They generally rent or borrow churches from the Catholic sect. This church was built with stones brought from Mardin, the center of Syriacism and has an administrative section and school.