A plaque memorializes the Boston location of one of the largest nightclub fires in history.

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

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

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

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

An enormous, inside-out glass globe built in 1935.

One of the now-less-hidden floral gems of the "Emerald Necklace."

Solar powered Spectacle Island features all-green facilities.

A disastrous shipwreck and a tragic love story.

This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

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

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

Last church of this militaristic WWII style.

Radical Bookstore and Community Space.

New England's "Witches of Eastwick" locations, in all of their quaint white churched glory.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

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

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

The homestead of American patriot John Adams.

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

The oldest surviving wood-frame building in North America is still in the family.

35,000 grape hyacinths flow like water down a garden hill.

The hill that gave the Massachusett tribe, and later the state, its name.

A memorial sculpture to heath hens stands on the spot where the last heath hen, Booming Ben, was last seen.