The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

An icy lake tucked among jaw-dropping alpine panoramas.

These quaint French houses dangle precariously over a precipice.

Since ancient times these picturesque springs have been providing bathers with healing waters.

This otherworldly French waterfall looks like its waters have turned to stone.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

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

For hundreds of years, this huge figure has been blessing visitors before they explore his body.

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

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

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

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

"There's nothing there," and other lies the KGB told us.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A former imperial sea-fortress and Soviet prison.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

Flamboyant architecture from the turn of 20th century.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

3,000 market stands in five former Zeppelin hangars.

A preserved oak tree about 3,500 years old found in Riga, Latvia.