A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

This bridge was constructed from the rubble of the infamous Bastille.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This modest marker near Notre Dame identifies the very center of Paris.

The narrowest street in Paris.

A massive Montreal stadium that has seen nothing but trouble since its inception.

The biggest museum dedicated to insects in North America, one of the largest in the world.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.

Toxic waste disaster that founded the Superfund program.

Only six people can sit inside this delightfully quaint sanctuary.

This 1836 church, constructed by formerly enslaved people, honors a leader in Afrocentric music.

Quite possibly the last cross all humans will ever see.

In the recreated studio of a visionary artist, a stone that may be more than meets the eye.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

This overlooked gem outside Niagara Falls preserves and celebrates Iroquois culture.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

A Roman holiday is closer than you think when you use this 1916 staircase inspired by Rome's Piazza di Spagna.

This three-story antique market and curiosity emporium claims to be "the largest singly owned antique shop in the Pacific Northwest."

A wall of chewing gum moonlights as collective art.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A stunning landscape of bunkers that once stored chemical weapons.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.