Prasat Top West (Khmer: ប្រាសាទតុបខាងលិច), also known as Monument 456, was initially built as a Hindu temple, then later transformed into a Buddhist one, complete with a platform bounded by sema stones.
In the 10th century CE the original temple consisted of a single sanctuary standing at the top of a cruciform laterite base.
At a later stage, the two lateral shrines were added and the central sanctuary was remodelled to include representations of Buddhas. The pedestal for a large statue of the Buddha can still be seen at the bottom of the eastern stairs.
Prasat Top West is located just south of the road, halfway between the Bayon Temple and the West Gate of Angkor Thom.