The Ancient City of Sigiriya is a UNESCO World Heritage Site located in Sri Lanka. It is famous for its stunning rock fortress, which rises nearly 200 meters above the surrounding landscape. Built during the reign of King Kasyapa I in the 5th century, Sigiriya features impressive frescoes, water gardens, and an advanced urban planning system. Visitors can explore the ruins of the royal citadel, including the remains of palaces and gardens. The site is also known for its iconic Lion's Gate, which leads to the summit. Sigiriya remains a significant cultural and historical landmark, attracting tourists from around the world.