sentences:  Of the underground churches that existed before legalization, some are recorded to have existed in the catacombs of Europe i.e.Catacombs of Rome and also in Greece (see Cave of the Apocalypse, The Church of St George and the church at Pergamon) and also in the underground cities of Anatolia such as Derinkuyu Underground City ("also see Cave monastery and Bab Kisan").Also noteworthy are the Church of St Peter in Antioch and the Cenacle in Jerusalem.