Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

These spooky and unusual stone formations create an underworldly landscape.

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

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

The Swiss hilltop housed an early 20th-century vegetarian nudist colony.

A macabre anatomy museum tucked within an old Italian hospital.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

A sunken idol welcomes parishioners to Davy Jones' Locker.

The highest waterfall in Italy is only "turned on" five times a year.

This half-finished "city of toys" was almost Italy's own Las Vegas.

This 1st-century CE Roman bath sits under a carpark.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

A once-luxurious, now abandoned hotel in the Italian Alps.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

The Slovenian architect designed many landmarks in the capital city, including his own dream house.

The monument honors the mountaineers who were part of Europe’s best anti-Nazi forces.

One thousand trees were planted in Norway to be used to print books a century from now.

An artist's mausoleum with a haunting echo.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.