Originally a temple to a trio of Egyptian gods, this enormous basilica, ‘Kizil Avlu’ in Turkish, was described by St. John the Divine in Revelations, in language much less than complimentary. Specifically, he called it one of the 7 churches of the Apocalypse, and the Abode of the Devil. Despite his protestations against its unholy character, it was eventually converted into a Christian church when a new basilica was built inside the old one, which should give you some idea of just how massive this crimson structure really is. This mixed temple-church-basilica-mosque still stands straddling the River Bergama, which passes underneath it via a pair of tunnels. You will easily spot the red-bricked, cathedral-sized roofless structure from quite a distance, along with the flood of fearless tourists and worshipers who dare enter this one-time house of the devil.