A surreal botanical garden with an even more surreal tour guide.

A stately castle in the northern Italian countryside has been restored after years of neglect.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

A 12th-century fortress containing some of Berlin's oldest buildings.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A fascinating insight into daily life in the Eastern Bloc.

A collection of abandoned typographic signs from Berlin and beyond.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An eerie, derelict amusement park in Berlin.

The bright red cars take travelers through breathtaking Tuscan scenery.

Artist Diego Morlin's war between the natural and human worlds is a wanderer's delight.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

An extraordinary house museum and cabinet of curiosities in the heart of Florence.

An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

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

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.