Angkor Wat is the most famous ancient temple site in Cambodia, and visiting the ancient Angkorian temples is the reason most visitors come to Cambodia, and to Siem Reap. With its five lotus-like towers rising 65 meters into the sky, it is truly a monumental, and awe inspiring signt. This UNESCO World Heritage sidte was at one time the largest pre-industrial city in the world, and is considered one of the ancient wonders of the world.
The ruins of Angkor Wat are located in the Angkor Archaeological Park, and the entrance to the park is located about 3km north of modern-day Siem Reap. There are no hotels within the park grounds, and most visitors to the ancient temples stay in Siem Reap, using it as a base from which to make daily visits to the temples. The most significant temple ruins are found 6 to 25km north of town, with the closest major temple being Angkor Wat. The Roluos Group of temples are 13km east of Siem Reap.
It is best to arrange your tour of the Angkor Archaeological Park with a reputable tour agency and a knowledgeable tour guide. They can assist with purchasing the admission pass, and arrange the trasportation you will need. There are also guidebooks availble, which will help in understanding.