It's a small secret, and I don't know if there's anymore writings like this on Nexus/any map, but check it out. Just follow the path from the specific turret and you'll find it.
I found this by failing at free running :P
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Edited by BritLemon: 3/13/2014 6:59:10 PMSubscribed to unsubscribe. Liked video and then disliked video. Muted and followed. Liked and reported.