Montezuma Well is a unit of Montezuma Castle, located 11 miles away from the main part of the park. As the Montezuma Castle it used to be inhabited by Sinagua people.
If you ask me, those guys here chose much nicer location for their homes - just next to a well that formed few thousand years ago by the collapse of a limestone cavern. The Montezuma Castle might look more impressive (and definitely is better preserved), but there is something charming about living in the cliffs above the turquoise water hole: