This is one of the largest stupas in Nepal and the world. It is located about 11 km from the center of Kathmandu. The stupa has a massive mandala, and it is a focal point for Tibetan Buddhism. It is a UNESCO World Heritage Site and a significant pilgrimage site for Buddhists. It is believed to contain relics of the Kassapa Buddha. The stupa is surrounded by monasteries and serves as a center for Buddhist learning and practice.