This one is a place where history and ancient times seem to get under your skin. Kariye or Chora Church in Greek has the best preserved Byzantine mosaics and frescoes of the 14th century. A century later, it was converted into a mosque, as many other buildings were, while the precious art was covered with coats of plaster. Only in 1945, when it was turned into a museum and renovated, people could finally see the monument in all its glory. Be ready for your neck to hurt from looking up at the ceiling.