A more substantial brick and stone building opened in 1873 at the southwest corner of Sixth Street and B Street NW (later renamed Constitution Avenue).
The Main Navy and Munitions Buildings were constructed in 1918 along Constitution Avenue (then known as B Street) on Washington, D.C.'s National Mall (Potomac Park), to provide temporary quarters for the United States Military.
However, even then the Capitol was never located at the geographic center of the territory (the geographic center was located near the present-day intersection of 17th Street, NW and Constitution Ave.).
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From there the course circles the Lincoln Memorial and goes off to the left to Constitution Avenue turning north on 19th Street and then northwest on Virginia Avenue.
(Other elements of the plan were the creation of the Third Street tunnel under the Mall and the relocation of a memorial to Civil War General George G. Meade from the northwest section of Union Square; that memorial now stands near the intersection of Constitution Avenue and Pennsylvania Avenue, NW.)
This temporary route extended west into Washington along newly completed East Capitol Street and the pair of Independence Avenue and Constitution Avenue to reconnect with US 50 at 2nd Street in Capitol Hill.
It originally served the B&P station on the present-day site of the National Gallery of Art, on the National Mall at 6th & B Street NW (today's Constitution Avenue).