Rila Monastery
The Rila Monastery (full name: Monastery of Saint Ivan of Rila) is the biggest and best-known Eastern Orthodox monastery in Bulgaria. This scenic UNESCO World Heritage site is believed to have been founded between 927-968, during the reign of Tsar Peter I, and is famous for its detailed frescoes, elaborate architecture, and historical significance. Located south of the Bulgarian capital, it's one of the nation's most popular tourist destinations.