The highest lighthouse in Scotland shines from an abandoned island.

The ruins of a medieval seminary some say is the oldest university site in Scotland.

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

This remote Scottish isle is only inhabited by seals, birds, and the memory of a tragic settlement.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

More gold than anywhere else, ever.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

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

This grave marks one of few bodies retrieved from the disastrous Franklin Arctic expedition.

Where the sleeping monsters of Scotland's oil industry are left to rust.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

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

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A church of bones, decorated with 40,000 human skeletons.