A castle built for love, and abandoned due to heartbreak.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This supermarket is suspended 25 feet above an interstate highway.

Why have you never heard of the second most popular tourist site in New York?

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

Ice cream stand, snack bar, and time capsule of milk conveyance.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

One of the indelible moments of the American Revolution took place at this location.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

The bears may be gone, but their old cages can still be found.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

These whimsical works of art tell the story of the city's past and present.

An enormous, inside-out glass globe built in 1935.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

A real plaque marks the spot where a Faulknerian character committed fictional suicide.

A mysterious stone embedded at the base of a historic Boston building.

The site of Paul Revere's historic two lantern warning.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Historic Hull Street was actually the first street with a proper name in the Boston area.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Tragedy on Little Brewster Island memorialized.

Narrowest house in Boston.