One of the deepest indoor swimming pools in the world.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

The secret meeting held in this building would forever change the world.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

Complete town of 5,000 living out at sea on the world's first offshore oil platform.

The village's cobblestone streets are lined with shops displaying exquisite copper craftsmanship.

This striking icon of the disputed Republic of Artsakh caused a stir at a Eurovision Song Contest.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Mysterious hillside with a continuously burning natural fire.

The house that took a plunge into the facade of a museum.

A breathtaking viewing platform over the Alps.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

The world's largest collection of intentionally useless inventions.

Visitors dip into a variety of pools of what was once ice.

Double spiral staircases are not unheard of, but they are very rare.

Ride a dragon train into a world of dwarves.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.