A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Legendary site where an evil bishop was devoured by rodents.

A former Nazi lookout tower with a magnificent view of the Rhineland.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

An ornate century-old elevator still connects the two halves of Bad Schandau.

Go surfing on this urban wave, "hacked" by local surfers.

The last bastion of Roman presence north of the Alps looms over a German town.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

In this truly magical place, rent hasn't been raised since the year 1520.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The footprint of a frustrated devil in Munich's Cathedral.

This 600-year-old home seems to defy physics.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

This German bone house contains the remains of some 20,000 souls.

An elevator into the Baltic Sea.