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 homestead of American patriot John Adams.

Site of an oft forgotten and revolutionary battle.

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

An Irish Memorial commemorating those who perished due to potato blight.

This elaborate towering structure was once famed for its revolutionary height.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

This parking garage was the site of what was - at the time - the largest cash robbery in history.

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

Narrowest house in Boston.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

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

Nature's biggest mammal swims in landlocked Oklahoma.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

Second largest wastewater treatment plant in the country.

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

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.