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The Metéora (Greek: Μετέωρα, "suspended rocks", "suspended in the air" or "in the heavens above") is one of the largest and most important complexes of Eastern Orthodox monasteries in Greece, second only to Mount Athos. The nearest town is Kalambaka, Greece. The monasteries are built on natural sandstone rock pillars, at the northwestern edge of the Plain of Thessaly near the Peneios river and Pindus Mountains, in central Greece. The Metéora is home to six monasteries and is included on the UNESCO World Heritage List. Metéora's criteria for the UNESCO World Heritage Site are I, II, IV, V and VII.

http://en.wikipedia.org/wiki/Meteora