Kartchner Caverns

Although these beloved limestone caves are not technically outdoors, they are plenty full of adventure. Discovered in 1974 and approved as an Arizona State Park in 1988, the jaw-dropping formations in Benson’s Kartchner Caverns have been growing for tens of thousands of years. The park offers two different tours, both of which are a half mile and an hour and a half long—both tours spend 50-60 minutes underground and offer up plenty of informational tidbits. Once you’ve made your way through the caves, be sure to pay a visit to The Discovery Center as well as the campgrounds, hiking trails, picnic areas and hummingbird garden. 520.586.2283, www.azstateparks.com/Parks/KACA