A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This freshwater spring fills with 10,000 gallons of water per minute.

World's largest Christmas store.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

This abandoned prison castle has become an imposing gallery of graffiti art.

This giant green head remembers one of America's jazz giants.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This statue intended for children to enjoy became a minor political spat.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

This memorial honors those who served on Gallops Island Radio Training Station during the second World War.

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

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.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.