Some pics cribbed from Google Maps

Meteora Greek: Μετέωρα is a rock formation in Trikala, Thessaly near the town of Kalabaka at the northwestern edge of the Plain of Thessaly near the Pineios river and Pindus Mountains. Immense natural stone pillars and hill-like rounded boulders dominate the local area. The pillars are not volcanic plugs of hard igneous rock typical elsewhere, but rather the rocks are composed of a mixture of sandstone and conglomerate. The conglomerate was formed of deposits of stone, sand, and mud from streams flowing into a delta at the edge of a lake, over millions of years. About 60 million years ago a series of earth movements pushed the seabed upward, creating a high plateau and causing many vertical fault lines in the thick layer of sandstone. The rock pillars were then formed by weathering by water and wind. It is unusual that this conglomerate formation and type of weathering are confined to a relatively localised area within the surrounding mountain formation. This type of rock formation and weathering process has happened other places locally and throughout the world, but what makes Meteora's appearance special is the uniformity of the sedimentary rock constituents deposited over millions of years leaving few signs of vertical layering, that and the localised abrupt vertical weathering.

Between the 13th and 14th centuries, twenty-four monasteries were established atop these rocks. Six of the original original twenty-four remain.