This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This shop filled with oddities and knick-knacks is named for a 19th-century charlatan.

An imposing pair of sphinxes stand guard outside this Egyptian Revival tomb.

A piece of baseball history is preserved in a Pittsburgh parking lot.

A lonely memorial to the Challenger Space Shuttle, honoring the astronauts who died in 1986.

Beautiful hillside Vermont cemetery with amazing funerary art.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

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

A small plaque promises cold, hard cash in exchange for work by the famous pop artist.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

A tiny monument to the classic American candy.

Impossibly life-like natural history models created out of glass by a father and son.

This is the house that spite built.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

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

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

A historic bridge with a lovely acoustic anomaly.

No one really knows how these old hobby horses got here, but the herd keeps growing.

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

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.