The remains of centuries of copper mining appear like an alien landscape.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

This park is home to a collection of important industrial and religious sites.

The decaying ruins of Wales' first asylum for the mentally ill.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

One man and his dog, immortalized in a giant statue.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

An abandoned, desolate train tunnel that was used during World War II.

Built as a training camp, this site became a detainment center for prisoners of war and German civilians during World War I.

In the middle of a barren moorland, the remnants of a lost British Space Age stand like a 20th-century Stonehenge.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

A monument to the 70s rock icon stands on the road into this small Scottish town.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

A historic shipbuilding town is home to a sail-through fish-and-chips shop.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

A modernist church in an ancient village.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The last of three massive blast furnaces that were once at the foundation of the Port of Sagunto economy.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.