The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

A museum dedicated to preserving, promoting, and advancing the art and craft of fine metalwork.

This black shoreline is made up of exploded lava particles.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

This Wyoming town is fascinated by a particular mythical creature.

A waterfall and cave near Arroyo Seco that inspired the writings of D. H. Lawrence, Willa Cather, and Mabel Dodge Luhan.

Spectacular 300-foot cliffs in a lush mountain canyon.

A clear blue swimming hole with hidden caves, still unexplored.

A swing to dangle you off the very edge.

An off-the-beaten path cave with an underground lake.

Limestone caves with spectacular showcase chambers.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

A stretch of highway even lonelier than the so-called "Loneliest Road in America."

This sign designates the road that leads to the infamous Area 51.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

"Only the devil could play golf here."

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.