This basement museum explores the art and artistry of fascism.

A haunting deserted hotel is a favorite with artists and photographers.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

An underground city of salt.

Annual technopop celebration of peace and love.

This 19th century cyclorama acts like an analogue time machine to a different era.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Fantastic stories on a miniature railroad.

The shell of a medieval fortress offers commanding views of the area it once protected.

This cubist Vienna church building looks like some sort of alien stonehenge.

This museum promotes informed contraception by documenting its often secret past.

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

American soldiers discovered Europe's best one-liner at the end of World War II.

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

"World machine" built by an untrained Austrian farmer.

Ride a dragon train into a world of dwarves.

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