A Maryland museum dedicated to Black history, housed in a historic church.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A historic cemetery filled with quirky faux wood art and unique tombstones.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This historic headstone is said to mark the final resting place of a doubly-dead white witch.

The Tallahassee Airport serves over half a million passengers a year and is home to some permanent residents too.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

America's first federal monument.

This grand gothic brewery has been pumping out suds for over a hundred years.

Famously misunderstood wonder of the ancient world

Try not to get slimed in Tribeca.

A computer bug so primitive it was an actual insect.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

An artistic tribute to the famous singer, just around the corner from where he was born.

The United States Capitol's former columns still stand.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Fittingly, America's museum of architecture is itself a magnificently designed old building.