Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

Three prestigious academic collections come together to create a world-class natural history museum.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

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

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

Over fifty whirling pools left by the glacial age.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

This mouldering abandoned mental hospital was once a center for progressive healing.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

One philanthropist's extensive collection of knick-knacks and curiosities is now a public museum of oddity.

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

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This historic park site contains the last remnants of a once bustling canal system.

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

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A wunderkammer hidden on the top floor of the Hartford statehouse.

This stunning Connecticut mansion is actually just a one-room-deep hoax.

These etchings reveal the history of a long-gone quarantine site.

A former copper mine which became a truly unsuccessful prison.