142 ceramic steps become a mosaic once a year.

A madman's personal garden filled with 1,000 sculpted heads.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

The Pope’s secret escape route.

2300-year-old Roman road connecting the empire.

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

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

Architectureal fantasy quarter of Rome.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A student driver's nightmare.

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

This magnificently macabre shield shows the power of chivalrous love in medieval times.

A naturally mummified 2,000-year-old man.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

Charles Babbage's proto-computer, painstakingly brought to life.

A tribute to an explorer and naturalist often overlooked by history.

The monster at the center of the Darwin Center Spirit Collection.

Repository for more than 22 million pickled specimens.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

This ancient Egyptian obelisk still bears the wounds of World War I.