So I was curious and found these interesting brass coins. You can't pick them up but they are around the Tower. Not sure exactly what they are for. In all I did some research and it's said if you find all 7 (so far) locations to take a picture and Bungie will reward you. Not sure if that was true but figured I'd post them and give the locations to people who haven't found them yet or who wan to join this train.
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Right after release bungie gave a emblem to people that found all of them. Don't think they do that anymore.
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Link doesn't work