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5. Meteora Monasteries, Greece
The Meteora Monasteries in central Greece are a breathtaking sight. Built atop towering rock pillars in the 14th century, they were meant to protect monks from invasions. Originally, they were only accessible via ropes, but thankfully, today there are stairways carved into the rocks. Out of the original 24 monasteries, only six remain active, each housing fewer than 10 residents.