The temple-mountain of Ta Keo was built in the end of the 10th century to early 11th century by the King Jayavarman V to Suryavarman I, dedicated to Siva (Hindu), replica to Kleang style of art.
This is the first Angkor temple to be built mostly of sandstone as well as the first to work up its inner enclosure into the form of a continuous gallery, and as such serves as a milestone in Khmer history.
Located in the east of Thommanon and ChauSay Tevoda at the west end of the East Baray, Ta Keo has 5 sanctuary towers arranged in a quincunx, built on the uppermost level of five-tier pyramid consisting of overlapping terraces (a step pyramid), surrounded by moat, as a symbolic depiction of Mount Meru.
Enormous blocks of stone were cut to a regular size and placed in position. Construction on Ta Keo seems to have stopped particularly early in the decoration phase as evidenced by the lack of carvings.