Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

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

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

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

A sculpture of a giant man escaping from the depths of the Earth.

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

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

A wax effigy of St. Valentine hides one of the saint's relics.

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

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

A notorious Route 66 eatery once frequented by Al Capone.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

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

University City's quirkiest resident lives in a park named after its first.

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

This is not your typical jungle gym.

One man's unrequited love stands in a glass box forever.

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

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

An abandoned meat mecca now serves as an excellent locale for urban exploration.

This unassuming riverbank is Missouri’s first designated site in the National Underground Railroad Network to Freedom.