The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Minimalist modern art on a repurposed military base in rural Texas.

Mysterious glowing orbs float through the desert night.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This is one really big nut.