Peel Castle is a historic fortress located on St. Patrick's Isle, off the west coast of the Isle of Man. The castle was built in the 11th century by the Vikings, and it was later used as a fortress by the English during their rule of the island.

The castle has been modified and expanded over the centuries, with the most significant alterations occurring in the 14th and 16th centuries. The castle features a mix of architectural styles, including Norse, Scottish, and English influences.

Today, visitors to Peel Castle can explore the ruins of the fortress and its various buildings, including the Great Garrison Hall, the Round Tower, and the Cathedral of St. German. The castle also offers stunning views of the surrounding coastline and the Irish Sea.

Peel Castle is a popular destination for tourists and history buffs, and it is easily accessible via a causeway from the town of Peel on the Isle of Man.