There are so many temples at Angkor that some of them get very few tourists. Baksei Chamkrong is a good example - it's a beautifully proportioned pyramid Hindu temple dating from the 10th century but it's located very near the South gate entrance into the much more popular walled city of Angkor Thom and most tourists don't make the small diversion to visit it.
Location: Baksei Chamkrong, Cambodia