Philadelphia Museum of Art
http://www.philamuseum.org/main.asp
Contains collections of all pertinent early American artists. Be sure to view Staircase Group (Portrait of Raphaelle Peale and Titian Ramsey Peale), a tromp l'oeil painting by Charles Willson Peale of two of his sons.
Referenced in:
Paul Philippe Cret
…But What Does It Mean? Symbolism in Artwork