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

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A playground the size of a city block is a modernist monument to civic values and public housing.

Peek through the gates at this oasis from the city, full of Old English charm.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Established in 1937, the oldest candy shop in New York City boasts a rainbow-colored inventory that would make Willy Wonka envious.

A seemingly out-of-place comic book surprise sits on the 21st floor of the tallest university library in the world. 

A series of murals depict the evolution of plant life from the Precambrian to the modern day.

This hollow steel globe is the second-largest in the world.

A giant concrete churn carries the legacy of American resilience, unity, and greed.

This woodland architectural installation acts as a camera obscura for the heavens.

This family-owned diner has been slinging chili dogs since 1940.