A historic bridge with a lovely acoustic anomaly.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This building is more than 250 years old and was built in one of the first towns settled in Massachusetts.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

A castle on a hill once named "the most beautiful high school in Massachusetts."

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This strange example of the Egyptian Revival architecture trend now holds Mardi Gras floats.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

Striking images of New Orleans history, including colonizers, soldiers, Klansmen, scientists, sharecroppers, and more, are depicted in frescoes that line the walls of this transportation hub.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The South's nickname was supposedly born at a former bank in New Orleans' French Quarter.

The beautiful, fruit-covered facade hints at this building's former life.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

On a side street near the interstate is the building where the famous anarchist once owned an ice cream parlor.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

Ruins of a once-prized railroad station in New York.