A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Large Hadron Collider and the Birthplace of World Wide Web.

Caves famous for the dragon-slaying saint who lived there.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Thanks to a clever legal loophole, this mountainside wine shop sells a hybrid cuvée that's been outlawed for nearly a century.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A functioning Roman-era aqueduct and bridge in rural southwest France.

The deserted pirate-themed restaurant still entices explorers.

This ancient theater was once the home of fierce gladiatorial battles.

A unique underground structure dating back to the 1st century BC.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The beautiful bas-relief lines a sliver of a 19th-century walking path between two charming French villages.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.