TheNationalGalleryofArtinWashington,D.C.,isoneoftheworl...
问题详情：TheNationalGalleryofArtinWashington,D.C.,isoneoftheworld'sgreatestartmuseums.Millionsofpeoplehaveentereditsdoorstoseepaintingsbytheworld'sfineartists.Butifthesepricelessmasterpiecesaretobepr...