in southeast Asia. There are different theories about the hill. Some say that this structure could be the foundation of a second pyramid. Others say that it could be the grave of Jayavarman IV. The steep path leading to the top of the hill is closed now because of security reasons. Sanctuaries along the access road Prasat Pram The most south sanctuary of this group is the Prasat Pram on the west side of the road. A small () long path leads to the monument. It has five towers or prasats (pram = five). Three brick towers stand in a row on the same platform. They face east. The central one is a bit taller than the others. In each of these prasats, once stood a lingam. These and the beautifully carved lintels were looted. Two prasats (faced west) are standing in front of the platform. One is built of brick and has diamondshaped holes in the upper part. This fact indicates that this tower once served as a fire sanctuary (fire cults were very important during the era of the Khmer kings). The other building is small, made of laterite and (in comparison with the brick towers) in bad condition. The bricks of small regular size are held together with an organic mortar of unknown composition (plant sap?). Originally the towers were covered by white stucco; remains of it can still be seen. Two of the towers are pictorially covered by roots. The five towers are surrounded by an enclosure. The collapsed entrance door (gopuram) is at the east side. Two artefacts of the Prasat Pram can be seen in the National Museum in Phnom Penh: A damaged lion statue and fragments of a standing four-armed Vishnu. Prasat Neang Khmau Located to the south of the main Koh Ker pyramid and built of sandstone and brick. An early 10th century temple dedicated to the Hindu deity Shiva. The temple's fire damaged (black) outer surface probably gave it its name (Neang Khmau means the "Black Lady" in Khmer). The name of the temple is also said mean "Black Virgin" and legend says it might once have been heaven to Kali, the Dark Goddess of Destruction. Another legend about the temple says that many years ago a powerful king Preah Bat Sorya Teyong lived at the Chiso mountain. One day his daughter Neang Khmao, went to Tonle Protron and met a