Pars, Quâ facillima ac expeditissima Methodus omne id, quod ad Architecturam attinet https://www.nga.gov/artworks/62422-perspectivae-pictorum-atque-architectorum-i-ii-pars-qua-facillima-ac-expeditissima-methodus-omne-id
Admission is always free 6th and Constitution Ave NW Washington, DC 20565 Only