On Sundays, it will seem like the entire city has descended on Ribera de Coritodores and Plaza de Cascorro. This is when some 3,500 stalls are open, hawking pretty much anything you can think of, whether used or new.
It’s the largest flea market in Madrid and gets pretty hectic, so it’s always a good idea to show up early. Even though it’s a Sunday the antique shops on the streets branching off Ribera de Cortidores will be open, and there are also cafes if you’re in need of a pick-me-up after wading through the crowds.