Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This simple home was the beginning of a long journey for the iconic Western film star.

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

Artworks by loners, prisoners and the criminally insane.

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

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

Swiss vineyards in a UNESCO heritage site.

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

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

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

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

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

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

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

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

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

These spooky and unusual stone formations create an underworldly landscape.

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

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

This natural sea arch highlights Ireland's rugged coastal beauty.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

A stone wall that mysteriously moved three feet from its foundation.