Can Masdeu

Can Masdeu is a squotted social center, residence and community garden in the Collserola Park on the outskirts of Barcelona.
We went there during one of the activities organized by Arquitecturas Colectivas, on July 2014.

Relations with the surrounding local population has been a focus of the efforts of the residents of Can Masdeu. The community encouraged local gardeners to come plant on their gardens on the grounds. These neighbors initially came from the Nou Barris district, but increasingly locals involved with these community gardens who move to nearby locations continue to come to this site and maintain their plots.

An amazing place in the middle of the nature but next to the city, focused on gardening, environment and permaculture.

Wikipedia explains it better.
Their official site.