Man-made geyser that rises to the exact height of the Gateway Arch.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

On the side of Arkansas' Great River Road stand the remains of a forgotten World War II POW Camp.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A museum within a museum, devoted to history's most questionable medical devices.

The only arched bridge made of stone on the entire Mississippi River.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

European castle ruins in an American state park are actually the product of death and grief.

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

This historic cliffside mansion uses a natural cave for air conditioning.

This abandoned prison castle has become an imposing gallery of graffiti art.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The first declared National Monument in the United States.

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

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.