Preah Khan is a temple you can visit through the circuit called “big tour” suggested by the Cambodian tuk-tuk.
Here is a description from Wikipedia:
“…Preah Khan is a temple at Angkor, Cambodia, built in the 12th century for King Jayavarman VII. It is located northeast of Angkor Thom and just west of the Jayatataka baray, with which it was associated. It was the centre of a substantial organisation, with almost 100,000 officials and servants. The temple is flat in design, with a basic plan of successive rectangular galleries around a Buddhist sanctuary complicated by Hindu satellite temples and numerous later additions. Like the nearby Ta Prohm, Preah Khan has been left largely unrestored, with numerous trees and other vegetation growing among the ruins...”
I’ve found a nice videos on the internet showing the temple:
Here are nice pictures: