The first declared National Monument in the United States.

This vintage animatronics show is the Vegas version of a walk through the woods.

An exotic wildlife habitat right off The Strip.

This former lieutenant governor's home is brimming with curiosities.

One of the world's earliest skyscrapers.

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

Two Ming Dynasty lion statues guard the entrance to the journalism school.

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

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

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

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

This mosaic-covered bar is brimming with curated curios.

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

Curious cave that stays a cool 56 degrees all year long.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

Unique tower has outlasted a takeover of the company.

Moonbows over Kentucky.

This conical hill was built as a testing ground for an engineer known as the Glider King.

A 12th-century fortress containing some of Berlin's oldest buildings.

A collection of abandoned typographic signs from Berlin and beyond.

Art and a pun, all in one.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."