With more than 200 years of formidable history behind it, British born-and-bred Christie's has presided over the high-profile auctions of the late Princess Diana's gowns and the phenomenal Ganz Collection of 20th-century art. Special departments are devoted to such non-fine-art valuables as wine, cars, and cameras. Subway: B, D, F, V to 47th-50th St./Rockefeller Center.