Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

The remains of a hospital ravaged by fire, once a progressive place of innovations for disabled children.

A cave dug by a man directed by ghosts to find pirate treasure.

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

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

This ambitious father and son team reigned supreme over the North End, and witches, for many years.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

The infamous Boston Mob ran rackets from an office here in the 1970s.

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

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

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

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

The Boston square dedicated to the dark poet who was born nearby.

A tiny monument to the classic American candy.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

A historic bridge with a lovely acoustic anomaly.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

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

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

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

The monument dedicated to Phineas Gage in the town where his accident happened.

This locally-famous crevasse in New York State is icy all year round.

Off a hiking trail in Rhode Island stands a picturesque memorial to a long-forgotten war.