This colossal Stupa was built by King Mahasena towards the end of the 4th century and is considered the largest Stupa in the world. It was originally about 160 meters tall and an estimated 93 million bricks were needed in its construction. It is believed that a part of the Buddha’s belt is enshrined within this Stupa. Surrounding it is a huge terrace capable of accommodating up to 30,000 devotees. The Jetavana Stupa is an excellent example of ancient Sri Lankan engineering and construction.