Over 50 whirling pools left behind from the glacial age.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A little-known hot spring haven right below the highway.

This seemingly charming home memorializes and honors the victims of a century-old unsolved murder.

A Memphis park where you can walk the whole Mississippi River in one go.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Acres of natural wonders left behind by a socialite-turned-gardener.

This painted blacktop brings the classic arcade game to life.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

This Seattle joint serves food inside an old train car once used by FDR.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

All of Chicago's wood-paved streets are long gone but two alleys remain.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Shop of curiosities with a dinosaur museum tucked in its basement.