15 Best Caves to Explore in Arizona

Head for the rugged Santa Rita Mountains and the Coronado National Forest to explore the limestone maze of rooms and passageways known as Onyx Cave. Various geological pressures slowly cracked the aged limestone here. Water rushed through the cracks, the cracks grew larger, and eventually resulted in this well-known cave.

The cave was declared an official National Natural Landmark in 1974 and fenced off to keep it safe from damage and vandalism. Today, after restorative efforts, it is back to its original condition. While it is reportedly challenging to reach, it is also possible to have the whole place all to yourself for several hours.  

Now owned by Escabrosa Grotto, Inc., all visitors must make reservations for a visit and gate key at least two weeks ahead of time. Once you’ve done that, you are all set to explore this cave system unencumbered by too many other visitors.

(Continued on next page)