In a dozen weekend trips to Cappadocia, I've seen no evidence of active Christian observance. But apparently, formal worship services still happen at least occasionally. On June 27, 2010, Patriarch Bartholemew of the Eastern Orthodox Church, based in Constantinople, joined with a representative of the Russian Orthodox Church, based in Moscow, to hold services in Derenkuya, at the Church of the Great Martyrs. Click. Russian Orthodox Church coverage.