Resonating tubes make music from highway overpass.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

It's not a typo, now say it five times fast!

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

This railroad tunnel was once the longest in Massachusetts.

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

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

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

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

A historic bridge with a lovely acoustic anomaly.

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

Over 50 whirling pools left behind from the glacial age.

This landmark cemetery in Boston was created more than 300 years ago.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The U.S. Fish Commission’s effort to mass produce carp.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

An Industrial Revolution-era public work that purified water using nothing but sand.

This rowhouse doubles as one of the most photographed spots in the nation's capital.

A rare example of a rural school in Washington, D.C.