The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The hallucinogenic center of the ancient world.

A spectacular cave and a beguiling lake.

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

The World Wide Web was created in this nondescript corridor at CERN.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

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

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Walk through a restaurant's refrigerator door to reach this hidden bar.

Museum of science fiction, utopias, and extraordinary journeys of the mind.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

A historic observatory precariously perched at the "Top of Europe."

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

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

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

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

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