Here are places with three organs we've seen and remembered - I've heard two of them but not played them...
1. Palau Guell (http://palauguell.cat/come-palace) where there is an interesting pipe organ (which is played during the day (via a midi player).
2. Sagrada Familia (http://www.sagradafamilia.cat/sf-eng/) which is now fairly complete and houses a rather nice organ behind the high altar which is again played during the day (usually by a midi player).
3. Palau de La Musica Catalana (http://en.wikipedia.org/wiki/Palau_de_la_M%C3%BAsica_Catalana) where there is a large instrument (which I’ve not heard).
There are photographs etc. on the web - just search with "organ" after the name of the location.
Enjoy!
Iain