Watertown Arsenal

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Watertown Arsenal Historic District
U.S. National Register of Historic Places
U.S. Historic district
Aerial view, 1921
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Location	Watertown, Massachusetts
Coordinates	42°21′44″N 71°9′58″W / 42.36222°N 71.16611°W / 42.36222; -71.16611
Built	1816
NRHP reference No.	99000498[1]
Added to NRHP	May 14, 1999

The Watertown Arsenal was a major American arsenal located on the northern shore of the Charles River in Watertown, Massachusetts. The site is now registered on the ASCE's List of Historic Civil Engineering Landmarks and on the US National Register of Historic Places, and it is home to a park, restaurants, mixed use office space, and formerly served as the national headquarters for athenahealth.