America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This beautiful architectural gem was the first waste treatment facility in Boston.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

Two thousand artifacts from around the world collected by one woman who loved to travel.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

The 1920s child prodigy author was last seen here at her Brookline home before vanishing at age 25.

Surrounded by lonely toys, this Massachusetts gravestone marks the final resting place of six children who were murdered by poverty.

The macabre paintings created by famous suicide proponent Jack Kevorkian, or "Dr. Death."

The haunting history of a little girl lost.

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

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Eliot was the first missionary to produce religious text for Algonquians in their own language.

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

A beautiful Victorian-era cemetery, complete with a miniature village.

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

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

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

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

This railroad tunnel was once the longest in Massachusetts.

Inside a state forest, the forgotten remains of a Cold War defensive installation.

An abandoned Victorian-era mill in the middle of modern Manchester.