Tantallon Castle is a historic fortress located on the southeastern coast of Scotland, near the town of North Berwick. Built in the 14th century, it was the stronghold of the Douglas family and is known for its impressive cliffside position overlooking the Firth of Forth. The castle features a distinctive red sandstone structure and remains a popular tourist attraction. The castle's architecture includes a large curtain wall and a central tower, which provide stunning views of the surrounding landscape. Although partially in ruins, Tantallon Castle is recognized as a scheduled ancient monument and is managed by Historic Environment Scotland, allowing visitors to explore its rich history.