The Scouts Found The City By Following The Floating Rocks

Alpha-Ray trained his recorder on the radio dish while Tau-Ray watched the horizon. As dawn glowed pink across the sky, Tau-Ray marveled at the wastefulness. All that technological prowess, and they used it to hang pretty stones in the air.

Concept art by Seung Jin Woo.

Scouts [moonworker1 on deviantART via Geek Art Gallery]