This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

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

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

Grave of the man allegedly responsible for a series of infamous murders in Boston in the 1960s.

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

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

Museum dedicated to awful artwork.

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

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

One-time largest man-made structure in the world will be a park in 30 years.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

Site of the first pathological and bacteriological research facility in the United States.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

The home, museum, and death site of Kodak's influential founder.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

This was one of the first (and last) university-built and operated nuclear reactors.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.