A mid-century telephone booth still stands, now a long-distance relic of the past.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

This octagonal rotary jail built in 1889 now serves as a visitor's center.

More than 12,000 years ago, this park was a playground for mastodons.

The oldest soda fountain in St. Louis has been serving up treats for more than a century.

The only remaining Cold War–era Minuteman II missile control center in Missouri.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

Where the author wrote her beloved "Little House" books.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

A kitschy, creepy St. Louis mainstay.

A remarkably opulent mansion with a tragic history.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

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

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

This mosaic-covered bar is brimming with curated curios.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

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

This enthusiast-led facility is the only museum in the country dedicated to the preservation of weather artifacts.

An Oklahoma museum that celebrates the history of the "Mother Road."

Oklahoma City's oldest arcade has reinvented itself as a competitive pinball mecca.

This unique landscape is the only place in the world to dig for hourglass-selenite crystals.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

Home to the story of the outlaw turned funhouse mummy, Elmer McCurdy.