During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

An eerie smiling woman looms above the granite tombstones.

A 19th-century cemetery device to ensure that the prematurely buried would be "saved by the bell."

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.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

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

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

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

One of the world's earliest skyscrapers.

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

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.

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

A unique museum dedicated to the Gullah-Geechee people, housed within an old oyster cannery.

Ruins of a Carnegie family mansion on Cumberland Island.

Mariners once used this prehistoric landfill as a navigational landmark.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The metal spire on the roof of this tower was intended as an airship docking station, but it was never actually used.

A winding district gerrymandered into the shape of a mantis.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.