Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

New fungal and bacterial species call this deadly lake home.

Mexican food and folk art.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

A Roman-inspired temple once controlled half of San Francisco's waters.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

An extensive collection of ancient Egyptian artifacts and mummies.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Dr Barnes' $25 billion private collection of art and arboretum.

A mysterious castle built as a monument to lost love.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

A Hawaiian stairway to heaven—that you can't climb.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

The largest earthwork effigy in the world.

One of the largest collections of holy relics in the country.

The only theatre in the world constructed specifically for sound movement.

Appropriation-friendly collection of books, periodicals, and more.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.