The Jetavanaramaya is a stupa, located in the ruins of Jetavana Monastery in the sacred UNESCO world heritage city of Anuradhapura, Sri Lanka. King Mahasena (273-301 AD) initiated the construction of the stupa. A part of a sash or belt tied by the Buddha is believed to be the relic that is enshrined here. The height of the stupa is 400 feet (122 m), it has a 8.5 m (28 ft) deep foundation, and sits on bedrock. At the time of its completion the structure was the third tallest structure in the world behind the Great Pyramids of Giza. Approximately 93.3 million baked bricks were used in its construction. The engineering ingenuity behind the construction of the structure is a significant development in the history of the island.