The signs of a long buried road can still be found hidden beneath a London sewer grate.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A fantastic castle rumored to be the birthplace of King Arthur.

Surreal riveted sea forts once protected the Kent shores from German attack.

A kaleidoscopic warehouse-maze of handmade neon signs.

The longest hedge maze in the world.

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

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

The largest of London's subterranean rivers and once a mad, bad center of London life.

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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

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

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

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

A curious structure built just for the birds.

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

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

Built during the Scottish boom in the oil industry, the village was never inhabited.

Geodesic dome luxury retreat in the Scottish Highlands.

A fernery hidden by neglect is uncovered, and an ancient specimen along with it.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.