Isle of Man: Peel Castle
Peel Castle is one of the oldest castles in the world, built in the 11th century by Vikings with further additions made in the 14th century. The castle sits on a small island in front of the town of Peel and is connected by a causeway. The castle is in ruins but nevertheless the remaining structures still present grand arches, walls, and the 11th century Viking-built round observation tower is still fully intact. It’s one of the most beautiful castles I have seen with incredible views toward the town and the sea, where one can observe seals and sometimes basking sharks close to shore (I didn’t get to see sharks).