A collection of huge, site-specific sculptures sitting in the Montana woods.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

Sitting empty in a lonely Canadian field is a century-old stone bunker sometimes called "One Man's Castle."