A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

An incarceration museum on the spot of possibly the oldest prison in England.

The longest hedge maze in the world.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

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

An unusual round church in London with a Templar past.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A tongue-in-cheek arcade where the games are based on everyday life.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

It was once the base for a series of domestic terror attacks.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.