[–] carlip 0 points 0 points (+0|-0) ago 

perhaps the beginning of an aricebo like telescope

[–] TheBuddha 0 points 0 points (+0|-0) ago 

Aliens...

[–] xyzzy 0 points 0 points (+0|-0) ago 

A roundabout.

[–] 137 1 points -1 points (+0|-1) ago 

Looks like an old foundation.