Every drop of D.C. tap water flows through this old waterworks.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

The home, museum, and death site of Kodak's influential founder.

An antique cemetery in New York, this land is home to any number of famed corpses.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

Rochester's signature culinary delicacy.

A memorial for public executions that dates back to the 14th century.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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

This pub boasts a curious history and may have inspired a Dickens character.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

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

This abandoned Victorian-style house was built in 1884.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.