Founded in 1981, this is the largest museum in the world created to address the under-representation of women in the arts.  Four blocks northeast of the White House, it's situated in a large limestone building, once a Masonic temple, and has been designated a National Historic Landmark.  In addition to the over 800 artists on display-Mary Cassatt's painting The Bath is perhaps the most notable piece-the museum is also politically active, and advocates worldwide for the necessary inclusion of women artists.

nmwa.org