The beautiful behemoth is one of the largest trees of its kind in the United States.

California's largest steel arch bridge.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

Colorful Native American paintings are hidden within this small cavern.

Depending on how it is measured, this lighthouse can claim to be the tallest in Europe and the tallest conventional lighthouse in the world.

The site where two doves fell in love.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This 400-year-old tree is actually an immigrant from North America.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The narrowest street in Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This tower is one of the best-preserved (and least-visited) remnants of medieval Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Order a boozy baba au rhum at the oldest patisserie in Paris.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

This emotive sculpture was originally created for the 1878 World's Fair.

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

The secret medieval communication system will whisk your words above the noise of the crowd.

Third time's a charm, or in this case, two testicles are.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.