This hidden alley near the location of Rome's first theater was the site of a curious miracle.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A Nesting Doll of Churches.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A massive marble foot is tucked away in a small alley near the Pantheon.

A statue representing a lost Roman profession that was vandalized for centuries.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

One thousand trees were planted in Norway to be used to print books a century from now.

An enormous public square and parade ground built to celebrate Ghana's independence.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

This floating sculpture of ice is a poignant reminder of nature's power.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

Hidden along this old street in Antwerp is a surreal monument of a bronze arm sprouting four hands.

A man throwing a giant severed hand towers over Antwerp’s main square.