Meteora

In a region of almost inaccessible sandstone peaks, monks settled on these ‘columns of the sky’ from the 11th century onwards. Twenty-four of these monasteries were built, despite incredible difficulties, at the time of the great revival of the eremetic ideal in the 15th century. Their 16th-century frescoes mark a key stage in the development of post-Byzantine painting.

Read more: http://www.promote-greece.com/2012/12/unesco-world-heritage-sites-in-greece-4.html