Vyborg Castle is a medieval fortress located in Vyborg, Russia, near the border with Finland. Built in the late 13th century by the Swedish during the Northern Crusades, it served as a strategic military stronghold. The castle features a distinctive round tower known as the Round Tower and has undergone various renovations over the centuries. The castle played a significant role in the region's history, changing hands between Sweden, Finland, and Russia. Today, it is a popular tourist attraction, showcasing exhibitions on local history and architecture. Visitors can explore its ancient walls and enjoy views of the surrounding landscape.