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

These unusual rooms on wheels are holdovers from the 1960s.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

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

This free, take-a-book shop seems like a trick but isn't.

This nine-story building is the oldest standing skyscraper in D.C.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

This lovely pocket park is one of the most under appreciated in D.C.

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

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

This grisly headstone doesn’t seem to be resting in peace.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

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

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This unassuming passageway played a key role in one of the most important events in U.S. history.