This bizarre Star Wars-like terrain is home to the largest of the religious cave buildings in Cappadocia, with a fascinating history and charming frescoes.
See a hidden gem of Istanbul, an Ottoman house of prayer nearly 500 years old, with magnificent tiles, built in the middle of the market in the Fatih district.
One of the most beautiful surviving Byzantine churches, with interiors laid out in fine mosaics and frescoes, has been converted into the impressive Kariye Museum.