There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

A memorial to a dog that inspired rioting in the streets of London.

There's an exclusive Beefeaters pub hidden in the Tower of London.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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

An unusual round church in London with a Templar past.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

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

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A famous burial ground with a history both grim and literary.

A naturally mummified 2,000-year-old man.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

Catacombs turned marketplace.

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

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

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.