Union Square is located at the foot of which historic neighborhood in Washington, D.C.?
Union Square (Washington, D.C.): Union Square is an 11-acre public plaza at the foot of Capitol Hill in Washington, D.C., USA. Capitol Hill: Capitol Hill, in addition to being a metonym for the United States Congress, is the largest historic residential neighborhood in Washington, D.C., stretching easterly in front of the United States Capitol along wide avenues.
Capitol Hill