Star Forts

"star forts are incredible, relatively unappreciated structures that have recently become a fascination of mine - humungous constructions that only really become visually stunning when you look down on them from above. this type of fortification design was adopted in the early 16th century [...] many of them still stand today in varying sizes. some are empty, some contain ruins. some, as you’ll see below, contain entire villages. [...]"

http://deputy-dog.com/2008/02/02/6-incredible-star-forts/