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.
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Category: Castles