In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Floating swimming pool within a moored vessel.

An eerie, derelict amusement park in Berlin.

The "Prussian Versailles" that is as glorious today as when it was built.

Beloved children's TV characters freckle the German city's streets.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

"The most colorful grottoes of the world.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A Saxony castle houses one of the largest and most outstanding mineral collections in the world.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

Willy Wonka would love this weird half-a-home.

This Toronto garden collects stares and tchotchkes in equal measure.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This whimsical fountain pays tribute to Toronto's four-legged friends.

It's always summer at the beach inside this former airship hangar.

Two monstrous faces loom over a village in Czechia.