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

The trials and tribulations of marking Poe's grave.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A wondrous old library overlooking the nation's capital.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This snug medieval lane is one of the narrowest streets in the world.

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

The abandoned funicular tunnel was a secret base for the BBC during World War II.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

Scattered throughout London are ancient remnants of the city's former bounding wall.

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

London's smallest police station is barely the size of a phone booth.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A massive maritime collision may have led to the myth of a resort island's strange financial status.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

Where monkeys run wild and the humans are caged.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Though tiki culture has gone in and out of fashion, the Tonga Hut has always been flying the flag in Los Angeles.

When you can't get to the Pacific, just go to Florida.

The ghostly remains of an accidental sea.