The imposing state-temple of Jayavarman V
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.