Whoops. Thank you. I added a comment about a transition of Ta Prohm just now.
I remember Preah Khan -one of the famous temples near Angkor Wat- was a Mahayana temple.
But I had forgotten Ta Prohm was also a Mahayana temple at first as Preak Khan. It was changed to a Hindu temple (probably after a death of
Jayavarman VII). He is a rare king among the then Khmer kings because he made much account of Mahayana Buddhism more than Hindu. I know there are some Mahayana temple remains near Angkor Wat. If you are interesting in temple remains, Preah Khan is just very interesting historical records. There are a lot of caved relieves of Buddhist saints. But all of them were cut their face... You can look a religious opposition and a power struggle in ancient times.