Washington Navy Yard
The WNY is the oldest shore establishment of the U. S. Navy.
Its extensive history is discussed in Wikipedia with consideration for military, cultural, and scientific areas.
Georgetown, D. C.
Port of entry for
Georgetown, included all the waters and shores from Pomonkey Creek on
the north side of the Potomac River to the head of navigable water of
the river. When the District was formed it was included, however,
after it was abolished in 1913, it became a part of Maryland.
Alexandria, VA
First settled in 1695, the port was a part of the District of Columbia from 1801 to 1846. The port included all the
waters and shores, bays and harbors on the south side of the Potomac
River from Cockpit Point to the highest tidewater. In 1871 that
part of the district of Tappahannock extending from Boyd's Hole to
Cockpit Point was annexed and the Potomac became a port of delivery.
Alexandria remained the sole port of entry until 1913 when the district
was abolished. During the Civil War the port was closed from
4/27/1861 to 9/24/1863.