Montezuma Castle right before the monsoon pounded us...
Montezuma Well was formed when a limestone cavern collapsed. It's a natural spring, so the well is constantly replenished by over 1,000,000 gallons of water per day.
Tuzigoot was built on a hilltop just down the mountain from Jerome was founded (much, much later). This is what remains 600 years after the site was abandoned.