Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Op-art architecture designed for happiness.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The final resting place for the remains of 143 Habsburg royalty.

Baroque celebration of the end of the Great Plague of Vienna.

Macabre astrological automaton clock dating to the late 1400s.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Two stunning 17th-century libraries and a cabinet of curiosities.

Model Trains and Much More in Hamburg.

An eerie, derelict amusement park in Berlin.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

The most visited, and possibly most controversial, museum in Germany.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Cold war icon and onetime "hole" in the iron curtain.

Berlin's old airport.

Metro station with a claim to rock n' roll fame.

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

Started as a kitchen garden, now the second largest botanical garden in the world.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

When the rain falls, this drain system turns into a musical instrument.

This "floating railway" is one of the world's oldest monorail systems.

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

This single room has survived the centuries with almost no deterioration.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.