Among the collection is the shirt worn by Louis XVI when he was executed by guillotine, still marked by a few drops of blood.

The memory of the ancient unit of measurement of local builders.

A completely underground tour following the path of the most precious element: water.

An old watchtower from the 16th-century now watches over sulfur springs and one of Lazio's last coastal woodlands.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

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

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

This building has a giant piercing through one of its corners.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The remains of Crystal Palace Great Exhibition of 1851.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

"The prettiest love letters in the world" ... or so said Lord Byron.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Legend says the only thing buried within this magnificent tomb was a dog.

The astonishing collection of an infamous criminologist.

A fake medieval village in the middle of Turin.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.