On the water, the sound from this horn could be heard from up to 10 kilometers away.

A 30-foot-high stream of chocolate flows continuously at the Lindt Home of Chocolate.

A massive observation tower that features gorgeous views and unique architecture.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

The largest underground lake in Europe.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

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

Vines grow up the metal bars in this public park created from an old machine factory.

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

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

A 22-million-year-old sandstone cave is a natural habitat for award-winning cheese.

These spooky and unusual stone formations create an underworldly landscape.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

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

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

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

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

Expertly restored pinball machines as far as the eye can see.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

Even Henry David Thoreau found this glacial pothole irresistible.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Haven for steampunks.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.