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

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

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

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

The last remaining 19th-century tenement from Boston's old West End neighborhood.

Around 160 years ago, this spot marked the location of a wharf along the shores of the Charles River.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

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

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

One of the indelible moments of the American Revolution took place at this location.

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

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

This historic patch of real estate offers a glimpse of colonial Boston.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

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

These whimsical works of art tell the story of the city's past and present.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

This landmark cemetery in Boston was created more than 300 years ago.

Beautiful steampunk ghosts of early Massachusetts.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.