Sant Miquel del Fai
This 11th century structure blends into the Cingles Bertí cliffs in Catalonia, Spain. Remarkably, the structure has never been restored. Visitors can hike from the nearby Riells del Fai village to explore caves, marvel at waterfalls and even stay overnight in the monastery, which has been converted into a hostel. See for yourself on the Catalonia Travel Guide website.