Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Just below the surface, shrimp are producing temperatures hotter than the sun.

Known as the most resilient water tower in the region.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

How did a 2,000-year-old Roman column find its way to a Chicago park?

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

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

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

A museum devoted to the victims and the survivors of the most catastrophic fire in American history.

Almost half-way between the Equator and North Pole.

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

This cave holds a surprisingly colorful variety of geological oddities.

At the top of the hour, this steam-powered clock's eight brass whistles play "Back Home Again in Indiana."

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The palatial McDonald's that inspired Wesley Willis.

A display of magnificent stained glass windows is the first exhibit of its kind.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

No one knows how many bodies are in this vault in a Chicago public park.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

Illegal drag racing two stories beneath Chicago’s streets.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.