Montezuma Well is a flooded limestone sink hole, about 55 feet deep, and it was formed by the collapse of a large underground cavern.
Montezuma Well, is a part of the Montezuma Castle National Monument. It is a unique geologic site located about 11 miles north of Montezuma Castle and it is the home of species of animals that are not found anywhere else on the planet.
A great place to stop along your way to Phoenix for a pleasant picnic. You will have to bring that because there are no vendors at the site, which is a plus.
Take your time wandering along the trails exploring prehistoric cliff dwellings, pueblo ruins, and bird watching.
Follow I-17 to exit 293 (4 miles north of the exit for Montezuma Castle). Continue through the towns of McGuireville and Rimrock, following the signs for four miles to the entrance to the Well. There is no charge to to visit Montezuma Well.