How illegal is it to climb a crane?

I'm into urban exploration and basically the one thing I haven't done is climb a crane. I don't actually know where one is that I could climb, but I definitely will do it someday. I'm just wondering how illegal it would be? Also, don't give me any it's not safe bull, I'm perfectly confident in my abilities and ready to accept the consequences if I get caught.

Answer:

Unless you have permission from the owner, it would be considered trespassing.

Not at all if you don't get caught. However cranes are private property, you'll get your a.ss handed to you if you get caught.

Here comes Chuck again with his everlasting wisdom. Heres Chuck:Climbing a crane is illegal. I love guns, and law and order!! My politics lean to the right. blah blah blah. Climbing a crane would be AWESOME. You should do it. videotape it, and post it on youtube for all to see.