An Inca spa, military outpost or maybe… both?

This demon atop the Notre-Dame de Paris looks utterly bored.

A Christian monastery stands on what was once a holy Incan temple.

A controversial magical figure is hidden within a diorama of the city.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This small monument to the great inventor contains a time capsule and a Wi-Fi hotspot.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

The last of Amsterdam's original sea level markers remaining in place.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A perfect circle of 24 mysterious holes dates back to prehistoric times.

Over 120,000 curious objects that have shaped our modern world.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

A world of whimsy and wonder aboard a one of a kind historic landmark vessel.

To find the "unicorns of the deep" you've got to go downstairs.

These pretty kitties killed and ate as many as 135 railway workers.

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

Illegal drag racing two stories beneath Chicago’s streets.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

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

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.