Marché aux Puces Porte de Clingancourt
More like a city unto itself than a mere flea market, this vast expanse—really a series of many markets accommodating a whopping 2,500 dealers—could easily take up an entire day. The antique furniture is superb, the chandeliers are splendid, but there are also many, many seductive objects far easier to transport home—everything from enamel kitchen canisters to wonderful vintage postcards of an earlier Paris. In winter, the hot chocolate vendors offer cocoa that is like nothing you've ever tasted, plus the landscape is dotted with excellent bistros. It's open Saturdays and Sundays, while some dealers are open on Mondays.