Koh Ker is a remote archaelogical site about 120 km (75 miles) from Siem Reap and Angkor. Koh Ker was founded by Jayavarman IV in 921 AD, so it predates Angkor. Its largest temple is Prasat Thom, which includes Prang, a seven-tiered pyarmid. Prang has been compared to many of the Mayan pyramids in Mexico.
All over Cambodia, we saw many used, US spec Lexus RX300s. Our guide even drove one as his personal car. This one, seen in a parking lot on Kulen Mountain, still had license plates and inspection stickers from Texas.
Our third morning in Siem Reap began with a road trip away from the city and into the hills to Phnom Kulen, or Kulen Mountain. This holy mountain is covered with jungles, temple ruins, waterfalls, and a scenic river. Along this portion of the river, King Suryavarman I and King Udayadityavarman II had carved many lingas and other sculptures into the stone riverbed.