A hacienda that features all things uniquely Yucatán.

An abandoned Cold War missile radar site.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Mile-long cave system near Great Smoky Mountains.

A sculpture for the sun and stars, created by Nancy Holt.

An obscure waterfall that looks like something out of a fantasy novel.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A wondrous old library overlooking the nation's capital.

The only diamond mine in the world where you can keep what you find.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

A short hike into the mountainside forest reveals a decaying 1890s town.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A house carved into a rock in the 1940s.

Legends surround this jagged rock formation in the New Mexico desert.

Couple's personal collection of pinball machines turned public pinball museum.

A small flooded ghost town with a few scattered structures remaining.

One of the ghostly stops along Route 66.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Moonbows over Kentucky.