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

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

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The sign at the garden gate reads: "These Plants Can Kill."

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

England's most famous front door has an accidental doppelganger.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

The fences outside some of South London's estates are made from recycled World War II stretchers.

An architectural oddity hides in plain sight on this iconic London bridge.

The Tudor-style cottage in the middle of the square is not quite what it seems.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

The cedar tree in Highgate Cemetery earned its title by accident.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.