A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A decaying concrete oil tanker served as a disposal location for bootleg hootch.

Ancient church constructed with a special wood that preserves prints from the past.

A library of poems cascade off the branches of this unsuspecting tree.

A 1960s damming project turned one family’s hilltop cemetery into an island.

This university research project is the U.S. government's weed dealer.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

From the dishes to the art, this Michelin-starred restaurant orbits around one beloved French melon.

Beneath the city of Lourdes, France is a massive, concrete church.

Trek up this glacier before it disappears.

The final resting place of the "father of special effects."

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Former hunting lodge of a duke who was an avid collector of impressionist works.

Museum in a swimming pool where the water still flows.

Ghosts of France's colonial past.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.