Barcelonins needing an escape from the city without heading far seek out this extensive, 80-sq-km park in the hills. It's a great place to hike and bike, and has plenty of cafes and snack bars. Pick up a map from one of the information centres (such as the Carretera de l’Església 92 location, close to the Baixador de Vallvidrera FGC train station).
The park has a smattering of country chapels (some Romanesque), the ragged ruins of the 14th-century Castellciuro castle in the west, various lookout points and, to the north, the 15th-century Can Coll, a grand farmhouse. It’s used as an environmental education centre where you can see how richer farmers lived around the 17th to 19th centuries. You can also learn about one of Barcelona's great 19th-century writers at the Vil·la Joana.