TheNationalGalleryofArtinWashington,D.C.,isoneoftheworl...
問題詳情：TheNationalGalleryofArtinWashington,D.C.,isoneoftheworld'sgreatestartmuseums.Millionsofpeoplehaveentereditsdoorstoseepaintingsbytheworld'sfineartists.Butifthesepricelessmasterpiecesaretobepr...