Sigiriya, located in Sri Lanka's northern Matale district, is an ancient rock fortress and palace ruin, built in the 5th century by King Kashyapa, and is recognized as a UNESCO World Heritage Site. It boasts significant historical and archaeological importance, with features including frescoes, ancient gardens, and intricate water management systems, making it one of the most visited tourist destinations in Sri Lanka. The site exemplifies remarkable ancient urban planning and engineering, capturing the unique cultural and historical heritage of the region.