Boats must transform into railroad cars to navigate this Polish canal.

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

This man-made mound monument was built out of soil from all across the Polish empire.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

Museum dedicated to "the man who moved the Earth."

The silly symbol for an underground protest group is now scattered around the city.

A 20th-century picture show in 3-D.

Relive a Polish uprising via an enormous, century-old cyclorama.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This automated sculpture of two men peeing will spell out text messages with their micturition.

Macabre astrological automaton clock dating to the late 1400s.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Five candy-colored villages on the Italian Riviera.

This winding road through an Italian canyon may be the most scenic drive in the world.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Ancient snack bar of the Roman Empire re-opened.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One part local history, 99 parts gruesome haunted house.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Hear the quietest sound from across the dome.

Pilgrimage site for star-crossed lovers.