Welcome to uega
Like what nuggs said, there is some graffiti I've seen which is mindblowing but we do discourage this activity at all sites.
Best way to get spots is to attend meetups/expos or hook up with other members. I usually prefer to mention places once I've met the member in person.
Subscribe to the Sydney meetup thread to find out when other members are going out or post to the thread if you decide to plan something (minus the location details).
Just a harmless explorer. No need to waste taxes checking me
