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We lived 4 years from 1967 to 1971 at 2010 P St. N.W. which is about 3 short blocks from the Phillips Collection. At that time admission was free. The place had an old time feel since it was in a house not a museum. It had comfortable couches in all the rooms. It was a place to go as often as possible and enjoy the art on the walls. A terrific collection of art. Over four years I got an education in fine art just by visiting the Phillips Collection as often as possible.
Now the place has been renovated and spruced up and there is an admission fee or request for donations during the week and a special fee for special exhibits. But it is still the best kept secret in Washington D.C. for places to go.
http://www.phillipscollection.org/visit/neighborhood/index.aspx
Here is more information about the history of the Phillips Collection in Washington, D.C. near Dupont Circle.
http://en.wikipedia.org/wiki/The_Phillips_Collection