This is not your typical jungle gym.

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

A big museum full of little worlds.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

A chessmaster's dream destination.

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

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

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

This mosaic-covered bar is brimming with curated curios.

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

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

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

A museum celebrating the Victorian obsession with hair art.

This otherworldly church spire reaches up toward the heavens.

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.

This "little gallery in the middle of nowhere" is housed in a 170-year-old horse barn in the Missouri Ozarks.

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

A museum dedicated to man's boldest venture.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

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

Giant granite rocks standing end-to-end like a train of circus elephants.

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

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

This pristinely abandoned filling station on the edge of a graveyard is populated solely by unsettling mannequins.