Montezuma's castle is a five-story, 20 room structure built into the side of a limestone cliff 100 feet above the valley. It was started around 1100 and was the home to about 50 Sinagu indians. Early settlers marveled at the structure and assumed that it was Aztec in origin, hence the name Montezuma's Castle, which was totally wrong. The indians who lived here were farmers and used the nearby valley for their crops.
The castle is now a National Monument and is a nice short, flat stroll from the nearby Welcome Center.