Boston Stone

42°21.711′N 71°3.402′W / 42.361850°N 71.056700°W / 42.361850; -71.056700

The Boston Stone is a stone in Boston, Massachusetts. It is near the Freedom Trail and is a minor tourist attraction.

The stone, a flattened sphere about 2 feet (0.61 m) in diameter, hollowed out on one side, is embedded in the foundation of a building on Marshall Street (a narrow alley named for Thomas Marshall) in the Blackstone Block Historic District. Below the stone is a plinth inscribed "Boston Stone 1737". It has been called "both an artifact of the early paint industry and evidence of early industrial activity in the vicinity..." It is considered the oldest paint-mill in the United States. There is no plaque, and the Boston Stone has no official status.