I think this areas is called the Leper King Terrace on the North end of the Terrace of the Elephants in the Angkor Thom complex, north of Bayon temple (Siem Reap, Cambodia). There is a narrow pathway that winds between the wall of the terrace.
Sewu temple is the second largest Buddhist temple in Indonesia, Borobudur is the largest. The Sewa temple is located in the Prambanan temple complex in Yogyakarta, Indonesia (about 1 km away from Prambanan temple). They are rebuilding many of the temples on the site which now lie in ruins.
Candi Sewu was likely built in the 8th century as the royal palace at the end of the Rakai Panangkaran kingdom.
Banteay Srei temple, Cambodia. The temple is an another amazing temple in the vicinity of Siem Reap, Cambodia. Banteay Srei is fairly small, but I was definitely very glad I took a day trip (1/2 day really) from Siem Reap to here and Kbal Spean.