The new Smithsonian Air and Space Annex at Dulles has the prototype 707 on display, its gone through all kinds of mods since day one, it looks great. They also have a Concorde and the only remaining Stratoliner.
Wish they had the surviving XB-70 on display, but its at Wright Patterson.
I wonder why Boeing didn't get more market share with the 247 and Stratoliner? It seems like until the 707, Boeing was always the underdog when competing for comercial airliners. Weren't the Stratoliners mostly used for transporting generals and other VIP's across the Atlantic during WWII?