Castlewood Canyon State Park in Franktown, Colorado is one of those places that makes you do a double-take and wonder if someone forgot to tell you that Colorado secretly contains portals to Mars.

Discover stunning hikes in Illinois for 2026! No permits needed, just lace up your boots and explore canyons, forests, and breathtaking views.

The cave includes rare aragonite crystals that form delicate, needle-like structures. These crystals are fragile and take thousands of years to grow. Flowstone cascades down the walls like frozen ...