Still on the subject of classic American restaurants, here's a photograph of The Grand Central Oyster Bar, New York. Back in the late 90's I used to spend quite a bit of my time in America (various auctions in New York and Philadelphia) and the Grand Central Oyster Bar, alongside P. J. Clarke's on Third Avenue was one of my favourite destinations.
The Grand Central Oyster Bar really is the most extraordinary place. It's massive: a cavernous warren of vaults, decorated with a mosiac of glittering Byzantine tiles in the Beaux-Arts manner. Imagine such a thing underneath Paddington Station!
It was founded in 1913, and originally served "Continental" (i.e. French) food, although it became famous for its oyster stew. From memory, there are various murky fish tanks dotted around the restaurant. I like the way you can point a long finger at your lobster of choice, and then a few minutes later the critter is paraded though the restaurant, held high by a waiter on a silver plated serving dish.