I was in Christiania (part of Copenhagen) maybe 7 years ago when the Danish cops raided the place in full riot gear. Scary shit, half the people ran , the other half stood their ground and confronted the cops. I stood around and watched for a bit , when I saw the cops winning (beating up people and arresting them) I got the fuck out of there.
its too bad, Christiania is not the same as it once was..
http://en.wikipedia.org/wiki/Freetown_Christiania