Op-art architecture designed for happiness.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

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

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

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.

A floating cat sanctuary on an Amsterdam canal.