A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Man-made geyser that rises to the exact height of the Gateway Arch.

A chessmaster's dream destination.

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.

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

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

One of the world's earliest skyscrapers.

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

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

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

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.

The empty tomb that houses the memories of Roy Bertelli's revenge.

The poet’s boyhood home is now dedicated to celebrating his life and legacy.

Abraham Lincoln's likeness rests at the top of this giant totem pole.

One of the largest carillons in the world, this giant instrument has 67 cast-iron bells played by a keyboard.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Home to a protest movement, a bombing, and a dramatic change in labor history.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.