Much has been written by others about the oldest of the Paris food markets, le Marché des Enfants Rouge, first established in early 1600s (dates vary). The name originates with the red uniforms worn by the children of a nearby orphanage, created in 1534. (Virginia of Paris Through My Lens had another explanation.)
You can shop for antiques, art, and brocante or you can buy the fresh produce for your evening meal. You can discover delicious (and affordable) Japanese, Moroccan, West African and Greek offerings in the food stalls -- crêpes as well!
It is situated in the northern Marais with two entrances, one at 39, rue de Bretagne and the other one around the corner on the narrow Rue de Charlot.