The Best Antique Stores and Flea Markets, According to the Pros

"Why it's great: I hesitate to share this one because once New Yorkers get a whiff, they may not have anything left. My favorite thing about this place, besides the friendly staff that helpfully wander the halls, is that it's a one-stop shop—it's alcove after alcove of treasures. From the outside it looks like a tiny store, but inside feels like Mary Poppin's never-ending purse. What to look for: I bought a brass birdcage (on a stand) for less than $100. It would have easily been fives times the price in New York."