Not in the same league as Angkor in Cambodia, but still a great place to visit due to the beautiful natural environment around the Temples.
The Temple, dedicated to Hindu Gods, was used as the religious centre for the Cham people when they controlled much of Southern Vietnam. Work began building a religious centre in the 4th century, and the temple complex was used continually till the 14th, the longest of any similar site in South East Asia.
With the decline of Cham power in the region the temple was abandoned. Sadly, during the American war, the temple was damaged significantly, destroying many of the buildings.