La Boqueria
This market hardly needs an introduction; La Boqueria has been chosen again and again, in all kinds of surveys, as the best market in the world. The place itself is a thing of beauty, with its incredible selection of produce on offer that has to be seen to be believed. Its bars serve the best breakfast in town (go very early in the morning, like 7 a.m., to get a place at the counter of Pinotxo). But it's best avoided between 10 a.m. and 3 p.m., when the crowds are unbearable.