A macabre anatomy museum tucked within an old Italian hospital.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The secret medieval communication system will whisk your words above the noise of the crowd.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This spectacular track has run continuously since 1882.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Wonderland replication in progress by one persistent man.

Village situated on a narrow volcanic escarpment.

Religious dwelling in a Spanish volcano.

A Spanish forest is filled with mysterious stone carvings.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.