Hilarious thread, haven't laughed so much in a long time...even got a couple of my own prime examples of security fails too...
Some particularly high quality fencing...
This fence was less than waist-height
Yep that fence ends about two feet from the wall and isn't attached to anything - one of the windows not in view had a board ripped off. I went back a week later and all the fencing had been nicked and about half the rest of the boards ripped off.
The van with a large gap either end is all that was stopping you accessing here...
Lets board the door up properly but neglect the people-width gap either side
This kind of counts - the mortuary of a huge, now-demolished derelict hospital in the north of England, because of where it was it was nearly impossible to get into the site without having the police called on you, but the security guard if you knew him would happily let people who just wanted to take photos into the buildings as he knew they wouldn't cause trouble. Anyway we were there and we asked where the mortuary was, before he buggered off he took us there but realised he had secured the door a few days ago - so promptly kicked the door off it's hinges for us!
Derelict theme park in Belgium....yep.
Boarded up mean spiky fence with two bars ripped off slightly further down
Lol