This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

What happened to the three lighthouse keepers who vanished from this place remains a mystery over a century later.

A close look reveals that the Scottish monument is just slightly off-kilter.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

“It has nae lugs!”

This Birnam-based garden honors the legacy of 19th-century children’s book author Beatrix Potter.

A red-brick beacon stands against the tempestuous Atlantic, on the windiest site in the United Kingdom.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

Stone age urban planning.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.

Popular river that runs through the remote Serbian municipality of Leskovac.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.