Caerphilly Castle is a medieval fortress located in Caerphilly, Wales. Built in the 13th century by Gilbert de Clare, it is one of the largest castles in the UK. The castle features impressive defensive structures, including massive walls and a series of moats, designed to protect against attacks. The castle is notable for its distinctive leaning tower, which is often compared to the more famous Leaning Tower of Pisa. Today, Caerphilly Castle is a popular tourist attraction, offering visitors a glimpse into medieval architecture and history, as well as beautiful surrounding parkland.