I think it is only Turkey where Christians churches of most denomination are found, Orthodox, Syriac, Catholic, Arminian, Assyrian, Bulgarian, Greek, protestants and other. Majority of ancient churches have been restored in recent years and open for visitors. 
Erdogan oversees reopening Bulgarian St. Stephen's church in Istanbul in 2018
A chaldaean church in dlyarbakir is under renovation
Roman Catholic church of St. Anthony of Padua in Istanbul
St. George's cathedral of eastern Orthodox Church and ecumenical patriarchate
A Roman Catholic St. John's cathedral in Izmir , turkey
The Armenian Apostolic Church in Vakifli, Turkey
Pammakaristos church of Greek Orthodox
Cromea memorial Church, church of Englandin Turkey
A Syriac Orthodox Church of Mor hananyo monastery , patriarchal vikarate in maradin turkey
