ip_glider,
If you're a journalist, you may stop reading this now.
If you're a terrorist, you could be interested in this :
To enter my ACC, you just have to dial "6412859" on the keypad beside the door. (I remember it easily as this is also my credit-card code)
Once inside, you can walk around naked if you wish, no-one will notice.
And don't shout it too loud : the automatic door has been unserviceable for 3 years now, so the door stays open 24h...