This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

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.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

An annual festival celebrating Colorado's most famous frozen corpse.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

This interpretive path lets you get up close and personal with dinosaur bones.

Even in death, he's still your huckleberry.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A technicolor place of worship for Elevationists.

This glass-stain Mary attracted thousands of pilgrims until her head was shattered by a vandal with a slingshot.

Four metal statues of massive animal penises stand outside the university's Animal Sciences building.

This South Carolina water tower is an icon of the city of Walterboro, but it also once served as the county jail.

The remains of this visionary community can still be found much as it was a century ago.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

The world's longest known cave system.

This bridge is haunted by the ghost of a distraught mother.

The site of a gold-digging conquistador's bloody landing in the Americas.