Boudhanath also called Boudha is a stupa in Kathmandu, Nepal. Boudha stupa is semicircle shaped and contains the relics and remains of Buddha. The stupa's massive mandala makes it one of the largest spherical stupas in the world. Stupas were originally built to house holy relics and some claim that Boudhanath contains the relics of the past Buddha, Kashyapa, while others say it contains a piece of bone from the skeleton of Siddhartha Gautama, the historical Buddha.