Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Erosion and time have created a naturally-formed water park.

One of the world's earliest skyscrapers.

During the 19th-century, this park was a vital trading fort.

This mausoleum is the final resting place of one of St. Louis's richest and most tragic families.

An abandoned factory along the Mississippi coated by a giant mural.

One of few surviving standpipe water towers in the U.S.

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

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

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

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

A kitschy, creepy St. Louis mainstay.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

This is not your typical jungle gym.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

This mosaic-covered bar is brimming with curated curios.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

Less a museum than a bizarre fantasy world created by artists and engineers.

A museum chronicling pioneer life constructed over Interstate 80.

This little gem of a museum is a hidden jewel filled with prehistoric treasures.

America's largest man-made forest was planted in an effort to bring back the past.

This once rural mansion now sits in the heart of the city.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.