This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

A 60-room castle constructed by a horse-racing heir.

Decades before the scandal, this staircase on the river was a literal "water gate."

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

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

A recently restored Shoreditch landmark with ties to Jack the Ripper.

Banksy gives themself artistic license with this piece of London street art.

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

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

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

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

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

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

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

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A bit of retro transportation flair preserved in the world's largest department store.