A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A notorious Route 66 eatery once frequented by Al Capone.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

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

This observatory comes complete with three separate telescopes and a dedicated community of amateur and expert astronomers.

Former self-sufficient mental institution now a planned community.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

This freshwater spring fills with 10,000 gallons of water per minute.

An Art Deco gem that held together the artistic heart of an agricultural community for 92 years.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

Half of a waterfall goes into the river while the other half seems to disappear.

Minnesota's highest point is a scenic vista marked by a plaque and armies of mosquitoes.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

A giant granite cross remembers missionary Father Frederic Baraga, and his safe passage across an angry Lake Superior.

This abandoned 19th century orphanage started as a boarding school for children of Civil War veterans.

This Mediterranean castle was built for a millionaire and his giant dog.

A fitting attraction for the corn capital of the world.

Moving, mind-blowing metal sculpture work of an outsider artist.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.