Bring your cause to Spain.
In case you didn't know, .es is the domain for Spain. Chances are pretty good that you've heard of .org, the domain for non-commercial entities and non-profits the world over. Put them together and you've got a winner with .org.es. It tells citizens of Spain that your organization cares about them and their needs. Plus, .org.es gives your group a presence in Spain, which could help gain awareness for your cause. And that alone is worth it.