One of DC’s more obscure attractions, this little-known museum is tucked away in the hills northwest of Georgetown and houses a fantastic collection of 20th-century modernist art. The art – by Renoir, Picasso and Mark Rothko, among many others – represents the amassed collection of David and Carem Kreeger, and their individual taste adds a charming degree of intimacy to the experience; you feel more like you’re popping into a home than visiting a museum. Speaking of visiting, you must do so on 90-minute, reservation-only tours unless you come for Saturday open houses. Exhibits are constantly rotated, so you’re just as likely to see Monet’s dappled impressionism as Edvard Munch’s dark expressionism.