An 18th-century townhouse that once hosted guests of the president.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

The site of the climactic scene from the classic horror film is now a historic landmark.

This historic boathouse was constructed using salvaged lumber from burned barns.

Two statues of the fictitious toy robots that ran afoul of local government

A wondrous old library overlooking the nation's capital.

A purported 17th-century religious artifact with noteworthy associations to Catholic history in the U. S.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

Trace the history of the nation’s early days at the site of America’s oldest stock exchange.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

The first American department store, and home to the largest operating musical instrument in the world.

This elaborate towering structure was once famed for its revolutionary height.

A daily replay of the experiment that proved the rotation of the Earth.

Dr Barnes' $25 billion private collection of art and arboretum.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.