In other words, the Spanish Town. It's in walking distance (edit: climbing distance) from Plaça d'Espanya. What you have at the end of some tedious 10-minute upward hike, is a mini version of the typical spanish village; houses, gardens, fountains, squares connected with narrow streets with museums and shops scattered around. The only thing you see that's not in real Barcelona would be the orange trees, probably. Which is precisely why you should consider it twice before you climb all the way up here and pay some ridiculous entrance fee. You already see the real thing out there!