Preah Khan is a Buddhist temple that was built by King Jayavarman VII in the twelfth century. It's north of the royal city of Angkor Thom, in the ruins of Angkor. To get from Siem Reap, you have to walk a lot, so it's better find other means of transportation. It's quite warm, and this temple is located more in the jungle, not as open as the temples of Angkor Wat or Bayon, where you have almost no surrounding vegetation. For this reason, take a good insect repellent, and if possible, wear a long-sleeved shirt and long pants. Night falls at 6 pm, so be ready a bit before to go back, since all of the tuc tuc go home early! The position of the temple also limits the amount of places to eat and drink compared to the rest of Angkor.