Sathmahal Prasadaya (Seven Storied Palace)
It is believed that similar pyramid-shaped stupas can be found in Cambodia and Siam, and that the Sathmahal Prasadaya may have been built for Cambodian soldiers who served under the Sri Lankan king. The building has four entrances on each side and a staircase that leads to the upper levels, but the original purpose and builder remain a mystery.
Constructed from bricks, the Sathmahal Prasadaya stands over 30 feet (9 meters) tall and can be found within the Dalada Maluwa of the ancient city of Polonnaruwa.