The birthplace of the man who patented the cotton gin and pioneered interchangeable parts.

A fragment of one of history’s most famous walls stands as a reminder of unity in a culturally divided city.

The oldest playground in America.

A historic bridge no one is allowed to cross.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

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

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

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

In the 19th century, this was the center of Boston's Black community.

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

The drawbridge used in the filming of the movie 'Annie' has been in the open position as it was in the movie for decades.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

Impossibly life-like natural history models created out of glass by a father and son.

This old mill and former police station now present a world-class collection of Orthodox iconography.

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

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

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

The haunting history of a little girl lost.

New York's southernmost subway station is whimsically wavy.

A sign marks the location of an 18th-century sawmill allegedly owned by a wizard who employed Satanic imps.

Ghostly specters are said to haunt this secluded cave where a famed Wampanoag leader spent the final days of his life.