From what I can see, there are 3 ancient pillars, and one marked ancient relic, the symbol of which when targeted looks like it might be something contained inside the pillar (didn't have the courage to shoot it!!)
When me and 2 other Cmdrs drove up to the pillars, our Wing symbol appeared at the top of the pillar; leading me to think there's a Wing action required here. Each of us scans one pillar each at the same time? We tried it and nothing happened, but that was before we found the 4th (the one marked ancient relic)