Soncino's castle, Italy

Built during the XV century over a pre-existing keep dating back to the X century, the castle saw a lot of conflicts, as it lies on the historical border between Milan and Venice. Restoration works began during the 1800s and went on for over a century. Today, this lovely castle can be visited for a very low sum of money (€5, iirc) which includes the ticket for the museum inside of it. Once or twice a year, medieval re-enactments and games take place in the castle.