Published on Dec 6, 2013 The four major Buddhist and Hindu temples in Kathmandu valley. All four are UNESCO World Heritage sites. 1. Swayambhunath is an ancient (about 5th century) Buddhist temple complex on a hill in Kathmandu . Also known as Monkey Temple. 2. Boudhanath stupa is one of the largest Buddhist stupas in the world, the holiest Tibetan Buddhist temple outside Tibet.