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

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The entire known universe of the ancient Etruscans is held inside this bronze model of a sheep’s liver.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

The rusting relics of Southampton's former luxurious flying boat industry.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

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

The final resting place of the great navigator, or maybe his brother.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Massive galleon from a box-office bomb docked in Genoa.

A marvel of Byzantine engineering under the streets of Istanbul.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Architectureal fantasy quarter of Rome.

Ancient ruins hidden underneath a modern luxury hotel.

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

Rome’s legendary peephole vista is also a former Crusader stronghold.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

A small Byzantine church lost in the middle of the mountains of southern Italy.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Climb the dead electric pylons of Messina.