Haunting and beautiful trees, doomed to die.

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.

These markers are used to document elevation changes around the famed dam.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This giant temperature attraction created some giant electric bills.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

Home to the "Circus" trees created by Axel Erlandson.

Dramatic river bend surrounds a natural red-rocked pedestal.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A strange house built only at night, with rumored mystic inspiration.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

An Aladdin's cave of old Silicon Valley tech.

A giant chess set, minus the psychedelic drug trip.