The celestial temple Prasat Vimean Akas in Angkor Thom (fig.) was built at the end of the 10th century, during the reign of King Rajendravarman and then completed by Suryavarman I.

It has the shape of a three tier ziggurat-like pyramid with on top a platform, that originally had a tower that was reportedly crowned with a golden spire, as well as some galleries.

According to a legend, the king had to spent the first watch of every night alone in the tower to meet a naga in the form of a woman in order to avoid his own death and great calamity to his kingdom.