Jones Point Light, a small river lighthouse on the Potomac in Alexandria, Virginia, was built in 1855 to warn naval ships approaching the Washington Navy Yard. Unlike a tall tower, it is a one-story house topped by a lantern. Its site is historically significant because the 1791–1792 survey of the District of Columbia boundary began at Jones Point, and the south cornerstone of that survey still survives beside the lighthouse. The light was discontinued in 1926, briefly replaced nearby, relit in 1995, and later dark again. In 1980, the lighthouse and adjacent cornerstone were added to the National Register of Historic Places.

Photo: Wikipedia · Public domain

Photo: Wikipedia · Public domain

Alexandria, Virginia · USA