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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

Marked by the hand of the explorer Henry Morton Stanley.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

The palace of the King of Kings, burned by Alexander the Great.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

17th century mosque for Shah Abbas' harem.

Former villa and estate of James Deering developed to preserve native tropical forests.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The oldest operating pharmacy in the world features 800-year-old recipes.

Secret refuge and museum of the Duke of Florence.

The middle finger of modernity.

Op-art architecture designed for happiness.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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