Remnants of cone-shaped fascist bomb shelters in Milan.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

Southern Italy's spinning top village.

The construction of a new church near Venosa was started in the 11th century, but never finished.

Geometry and mystery come together in an epic show of octagonal masonry.

This precariously perched fortress was once ruled by a crow-worshipping baron.

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

An Italian hillside ghost town.

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

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Giant granite sculptures representing family on the northern coast of Spain.

The oldest Roman lighthouse still in use.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

The world's tallest statue of a woman wields the world's tallest sword and is at risk of toppling over.

This massive monument honors the first human in space.

Gargantuan home of Russian science.

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

Stalinist skyscraper built with help of cryotechnology.

Former headquarters of the KGB.