A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

One of the greatest maze designer’s greatest mazes.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Abandoned railway line circling the city of Paris.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

French Time Capsule-19th Century home revealed to the public.

This huge work of functional public art replaced a landfill in New Jersey's Meadowlands.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

A decorated war pigeon stands guard in eternal taxidermied rest at his alma mater.

This colonial mansion has been home to a staggering number of American historic figures.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

The site of one of history's most indelible and horrific tragedies.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Two thousand artifacts from around the world collected by one woman who loved to travel.