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

An eerie, derelict amusement park in Berlin.

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

Art and a pun, all in one.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

Apartment complexes built into huge repurposed natural gas tanks.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

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

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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

Op-art architecture designed for happiness.

This former insane asylum now holds a pathological anatomy museum.

Macabre museum devoted to historical Viennese murders.

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

The beautiful baroque library of the Hapsburg empire.

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

One of the most important yet well-hidden museums dedicated to the history of medicine.

A sculpture serving as an homage to Pope John Paul II.

A hospital where antique dolls are given new life.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A collection of objects supposedly singed by the hands of souls in purgatory.

A fairy tale castle in modern Rome.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.