A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

An industrial relic is now one of Europe's most staggering art spaces.

This former steel and coal plant is now a neon-lit industrial fantasia.

No need to strap in for a “ride” on this walkable roller coaster.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Paris' linguistic guide to the international language of, yes, love.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

Crop circles inspired this whimsical garden in Germany.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

Abandoned railway line circling the city of Paris.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A larger-than-life monument to the inventor of the Bunsen burner.