A lush green oasis in the middle of Chicago.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A self-built castle made by a mysterious man.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A hotel and restaurant serving as the mecca of kitsch.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A castle that was built stone by stone by an eccentric journalist.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Where beautiful signs live on forever.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

A library of rare occult books in Los Angeles.

Olfactory delights in San Francisco's Botanical Gardens.

A hands-on traveling collection of the innovative devices of yesteryear.

Odd outsider art installations surround a Gold Rush-era ghost town.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Rainbow-hued local gem in Venice.

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.