Romantic-looking Castillo de Butròn in Gatika, Basque Country, Spain. Altho the original castle dates to the Middle Ages, the current building is late century. I love the look, but it seems to have been an unfortunate folly.
Le Château de Pierrefonds Oise France Pierrefonds century mediaval castle in france -also featured as Camelot in the TV series Merlin.
Medieval, Loket Castle, Czech Republic photo via furkl triple arch