Caen Castle, or Château de Caen, is worth a full day of any visitor's time to this historic city in Normandy. Not only does it house the history-filled Museum of Normandy and the Museum of Fine Arts; its grounds are beautiful, its buildings are a favorite of shutterbugs, and climbing the ramparts gives you a bit of history as well as a fantastic view.
Originally conceived in 1025, construction on the Caen Castle was started in 1060 and ended in 1210 with the full enclosure of the walls, which proved to be a godsend in the mid-13th century when a siege on the town by King Edward III of England proved to be no match for its walls. Today, through ongoing renovations, there is still so much to see of this fortress – and that's not including the two museums.
The castle is open every day to visitors, and it is free to enter -- locals use it as a shortcut between neighborhoods! Don't miss looking down onto the current excavations from the top of the rampart walls.