An Italian hillside ghost town.

Architectural monsters are devouring this palace's every door and window.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Geothermal waterfalls in Tuscany.

Pompeii's less famous neighbor is still revealing her secrets.

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

A 16th-century horror show built in a lovely Italian garden.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

Seaside ruins of a settlement that date back to the first century B.C.

The Gaudí-inspired building that was the start of Terrassenc modernism.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

A 16th-century Andalusian palace.

Moorish signal station on a stratgic rocky outcrop.

Village situated on a narrow volcanic escarpment.

The world's largest wooden structure.