One architect's organic, human-centric design has been fully realized in this alien art house.

The location of the last witch trials of Italy, known as "The Salem of Europe."

This massive blockhead sculpture hides an entire library.

Nearly every wall in this French villa has been "tattooed" by artist Jean Cocteau and other famous painters.

A medieval military street hidden beneath a charming French fishing village.

A beautiful discovery site of prehistoric burials.

Every year, the town of Menton, France, turns lemons and oranges into giant sculptures depicting windmills, dragons, and more.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

The "shampooer of kings" who opened London's first curry cafe was a celebrity in the 19th century, but is all but forgotten now.

Before becoming a poet John Keats studied here to become a surgeon.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This 130-year-old, steam locomotive represents the Spanish industrial and agricultural boom of the late 19th and early 20th century.

The first firefighters museum in southern Spain is ironically located in an old textile mill that burned down in 1985.

Continental Europe's only museum devoted to salt and pepper shakers features more than 20,000 designs.

This ancient fort has been a great insight into the Roman presence in the region.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

This decaying complex from the early 1900s was once the site of massive iron and fluorite mines.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

A unique collection of Swiss art brut and naïve art displayed in an old warehouse.

A 13th-century Swiss castle houses a collection of artifacts from the Polish diaspora.

The world's longest and deepest train tunnel.

The steepest classic funicular in the world glides along a dizzying incline.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.