La Boqueria Market in Barcelona puts all other markets to shame. Whether you are there to shop or just there to look you will have a good time. This place is huge and has every type of fruit/meat/cheese/candy/seafood/spice/bread that you could ever imagine.
If you are just there to look, you can pick up a fresh fruit smoothie for €2 or eat at one of the many restaurants inside the market. My favorite is Pinotxo Bar right when you walk in to the right.
De-lish seafood. Always fresh.