Peek through a transparent pyramid and drink in the mountain made of books.

Amsterdam's Red Light District leaves little to the imagination.

Museum preserving torture methods from the past.

The history and future of cannabis.

A 30-acre garden inspired by the principles of modern physics.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Protecting the dead from opportunistic body snatchers.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Fantastically decorated underground chambers built in the 1760s.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A hands-off space for graffiti artists to hone and display their skills.

The monster at the center of the Darwin Center Spirit Collection.

Hidden beneath the streets of London is a secret subway that only carried mail.