The Serbian Orthodox Church of St. Cyril and St. Methodius, Ljubljana, Slovenia
Concierge.com's insider take:
This splendid church was built in 1936 at the edge of Tivoli Park. The bright, creamy yellow exterior is compact and Eastern-influenced. The dark interior is heady with incense, and every inch of the walls is slathered with frescoes in the bright primaries of the iconic Byzantine era.