Codextober day 9: Historical

I figured of all the historical landmarks in Assassin's Creed I should probably do one that was geographically closest to me.

I've not played Valhalla but I knew there would be no way there wouldn't feature standing stones somewhere.
And sure enough, when I looked it up, there a puzzle at Stonehenge.

I had to trace the symbol from a walk tough since I couldn't get a clear pic of it.