This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

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

Picturesque ruins once held off mighty armies.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

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

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

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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.

The curious underground history of keeping Paris clean.

This Swedish automobile graveyard is a beautiful gallery of decay, but woe be to any who would steal a souvenir.

The sunken structure looks like the victim of a catastrophic flood.

This island castle now hosts a world-famous opera festival.

Villas that once served as playgrounds for the rich now fall away in decay.

These lakeside pictographs were some of the first pieces of prehistoric artwork found in Finland.

This former hospital was once one of the oldest mental health facilities in Europe.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

Finnish lake, and scene of an infamous murder mystery.

Crawling into this primordial cave may feel disconcertingly familiar.

A small island dotted with old, historic Finnish buildings.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

An abstract monument to a symphonic composer.

This irregularly shaped sea fortress has defended not one but three different sovereign states.