France's most famous cemetery, with some of its most curious tombs.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The ancient tomb acts as a calendar that keeps perfect time.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An ancient neolithic tomb that only sees the sun twice a year.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

An 1814 castle that hosts an exhibit of "explorabilia".

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

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

A small sanctuary carved into the mountainside near the tallest point in continental Portugal.

One artist's collection of homemade handicrafts doubles as a monument to 20th-century material culture.

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

A neolithic tomb converted into a tiny chapel.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

This crumbling Portuguese ruin overlooks the populace it once ruled.

An Irish peat mine has become a stunning sculpture park.

Just another ancient, mysterious Irish stone circle.

The half-finished remains of what would have been Scotland’s biggest piece of landscape art.

Final resting place of the author who wrote the ghost story "The Turn of the Screw," and his brother, the Harvard doctor and paranormal investigator.

The mighty room where the poet spent most of her life is available to rent for an hour or two.

Where Eunice Williams was murdered by natives, and where locals say her ghost still haunts.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

Inside this old train depot resides a multi-line model train covering western North Carolina.