The commemorative stone column conceals a secret laboratory.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The lost library of Alexandria, revived as a spearhead of cultural preservation.

Part shoe store, part sociopolitical art gallery, part zoo.

One of the most well-preserved temples of ancient Egypt.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

Profile of a sleeping person 4km long in 250m high cliffs.

A colossal statue with a controversial past, forgotten for more than 30 years.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

This statue in Plaza San Francisco commemorates a beloved figure from 1950s Havana.

Standing in this historic plaza is a statue representing one of Cuba's most iconic literary characters.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

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

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Once the home of a hermetic monk, this cave now houses a small church.

Budapest's Communist-era statues, banished to the suburbs.

A World War II evacuation tunnel turned into a history display of Croatian state and people.