So I've stumbled across a secret room. After jumping around in the antheon throne room I found it actually hidden in a wall on the left hand side. This could quite possibly be a room that could store another chest. By the look of the room it looks like it was made for a purpose. It's not easy to get to but it's easy enough that you could get there for a chest. Will keep updated.
Update. I've made a 30s clip on my xbone. If you would like to see then go to my profile and watch. Gt - sgt chubb brown.
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#Destiny
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I found that room, before, but I haven't found anything special appear there (at least on normal). There is an easier way to get to it as well. Instead of going all the way around like you did, you can jump toward the entrance side and climb up, there is a little corridor between the high part of the structure and the wall and it will then just be a strait drop down. You can also jump up from that little corridor and land on top of the structure and get a bird's eye view of most of the map.