Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

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

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

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

A mysterious artist-run cabinet of curiosities and library.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A cluttered and astounding collection of antiquities and curiosities.

A modern English garden of eccentric beasts, follies, and oddities.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A 200-year-old prison that now houses a peculiar crime museum.

An unusual round church in London with a Templar past.

The atmospheric road was never meant to be so creepy.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

This South London cemetery holds the remains of more than 15,000 people.