The Castle of the Holy Angel was built by the Roman Emperor Hadrian in about 139 A.D. as a mausoleum. It was later used as a castle by the popes. Today it is a museum.
Jigsaw puzzle subject image credit: Special thanks to Bert Kaufmann for making the photograph used for this jigsaw puzzle available through the Creative Commons Attribution ShareALike license. Visit Bert Kaufmann's Flickr photostream.
See all jigsaw puzzles based on Bert Kaufmann's photographs.