Medieval castle with a flag on a sunny day, surrounded by greenery and with a scenic view of the countryside, Bolton Castle, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

Bolton Castle, where Mary Stuart was imprisoned, Wensleydale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Carew Castle, Wales, UK

Black Tower of Prague Castle at dusk, Prague, Czech Republic.

Prague city at dusk as seen from Prague Castle, Prague, Czech Republic