This unique historical monument features large concrete spheres designed to resemble fallen stars.

FDR's Art Deco hospital tower was hopelessly inefficient.

Illegal drag racing two stories beneath Chicago’s streets.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

When it opened during the final years of the embargo, all the drinks and cigars were free.

There’s a hidden military meme engraved on the World War II Memorial.

The national park was once a plantation estate.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

A celebrity from the late Cretaceous period.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

D.C. once had its own tiny rival to the New York Stock Exchange.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.