This massive stupa, which dates back to 1st century BC, was once the ceremonial centre of focus for over 5000 monks of the Abhayagiri Monastery. At the time of its construction, the Stupa stood over 100m high and was matched in size by only the Egyptian Pyramids. According to an ancient scripture, a statue of a gold bull containing relics of the Buddha was buried in the centre of the stupa. After numerous changes in the Buddhist sect, kings and political upheaval, the stupa eventually was abandoned and fell to ruins, only to be rediscovered again in the 1980s. After several reconstruction efforts, the Abhayagiri Dagoba now stands at 75m above ground. The stupa is visually breathtaking, and the bas-relief that surrounds it is also worth seeing, including one of an elephant pulling up a tree.