Vilnius Castle is a historic fortress located in Vilnius, the capital of Lithuania. It consists of several structures, including the Upper Castle, the Lower Castle, and the Royal Palace. The castle complex dates back to the 13th century and played a significant role in the defense of the city. Today, Vilnius Castle is a popular tourist attraction, offering stunning views of the city from its hilltop location. Visitors can explore the ruins, learn about the castle's history, and enjoy the surrounding Gediminas Hill park, which is a key part of the Vilnius Old Town UNESCO World Heritage site.