Great Britain is famous for its many ancient castles located in England, Wales, Scotland, and Northern Ireland. The summary provides details on four of the most beautiful castles: Dover Castle, an enormous fortress situated on the English Channel coast; Caernarfon Castle, built in 1283 on the site of an ancient fortification; Edinburgh Castle, an ancient fortress located in the center of Edinburgh on Castle Rock; and Harlech Castle, one of the most famous castles in Wales built over seven years in Wales on the orders of King Edward in 1283.