The liveliest ghost town in the state.

Quite simply the largest tree in the world (by volume).

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A natural dome made of volcanic glass in Inyo National Forest.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

The home of famed war correspondent Ernie Pyle is now a library and museum dedicated to his memory.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

More than 21,000 images fill this overlooked gem of a prehistoric site.

A pair of gargoyles peer into unsuspecting passengers at Denver’s conspiracy-packed airport.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

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

Visit the home of Sweden's beloved fictional character, Pippi Longstocking.

A miniature train-ride through Slovenia's largest cave system.

A half-acre utopia in the New Mexico desert features a graveyard, a game of horseshoes, a library, and a mailbox.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

One of the most unusual geological features, recognizable from a dozen hit movies.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.