An unusual cave filled with rare alien-looking aragonite formations.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Antiques shop filled with all manner of curious collectibles.

Step aboard the first ship to circumnavigate North America.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

This log house sits in the remote Canadian wilderness, and holds a mysterious tale of the trapper who built it.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

A 1995 memorial acknowledges the tremendous contributions of Vietnamese refugees to Canada.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

How did a French journalist’s grave become the sexiest statue in the cemetery?

France's national museum of scientific and industrial instruments.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The oldest stone house in Paris was built by its most famous alchemist.

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

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Lavish royal estate punctuated with heated greenhouses.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

A rare venue to buy specialty maps.

Despite the name, the waters of this Canadian lake are actually blue-green in color.

This Italianate house was the childhood home of the prominent Canadian painter, Emily Carr.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.