The broken skateboards that became a poignant memorial to a murdered skater.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

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

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

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

This coffee shop lies hidden beneath a historic church.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

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

Rebuilt remains of a temple to Roman god Mithras.

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.

Tour the sci-fi-esque reality of governmental disease management.

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

A student driver's nightmare.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Pop culture has helped to keep this iconic British building from being destroyed.

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

A late-night restaurant empire was launched from this humble storefront.

An early-19th-century hotel with a past that is steeped in the Civil War.

A sweet tribute to Georgia's official state vegetable, which even has its own mascot: "Yumion."

This twisty sign depicts the chain's first logo.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.