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

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

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

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

An adorably sweet display of sculpted Precious Moments figurines.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The remains of a enormous earthen figure of unknown origins cuts across a rural Wisconsin road.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

The watery grave of an impractical idea.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

This three-dimensional brick mural is the longest of its kind in the United States.

This century-old painting of a portly 10-foot-tall man spent years hidden behind plaster.

The oldest house in Lindsborg, Kansas, includes some fascinating inscriptions.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

This 41,000-acre wetland complex is the largest marsh in the interior of the United States.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Also known as the Cathedral of the Plains, this church holds the distinction of being one of the "8 Wonders of Kansas."

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.