Apparently there are no flags up there so it seems a little unlikely given how long I've tried to get up the ****er. I spotted one or two places that look like I should try there but they're blocked by invisible walls. It seems silly that Ubisoft would stop you from getting up there, the first thing I thought when i started playing was "Damn, I'm scaling that thing" But I've still found no way up any part of it. I got onto the big symbol in the entrance hall where the main dude is and onto of the gazebo looking thing in the garden but thats all
your not ment to climb it...