Thirty creepy ghosts now inhabit this decaying 14th-century church.

A statue of the heroine who stopped time to save her betrothed.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

No one really knows how these old hobby horses got here, but the herd keeps growing.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.

A touching tribute to the "Queen of Soul."

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

A bizarre house filled with an astounding array of collections.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

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

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

A haunting collection of the vanished and disappearing natural world.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

This massive library holds what was once the largest book collection in the world.

Notorious artist squat renovated into legal studios.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.