A nomadic museum known for its art exhibitions about religion and faith.

A beautifully eclectic mix of architectural styles.

Museum preserving torture methods from the past.

Cat art as far as the eye can see.

This unattributed sculpture in Amsterdam is hiding in plain sight.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

An exotic wildlife habitat right off The Strip.

A giant open-air sculpture made of over 200 full-sized boats.

Yo, Adrian!

An ancient ossuary in Rouen.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The celebrated eyesore created by starry-eyed sweethearts.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

France's most famous cemetery, with some of its most curious tombs.

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

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This private residence was the template for one of the most beloved television homes of all time.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.