Castles Made of Sand

On a alien shore on a far distant world two space explorers find dozens of huge, mysterious sandcastles. Where did they come from? Who built them? And will the men survive long enough to discover the answers?

Castles Made of Sand is a short story of 3500 words. It has been published twice, originally in the ezine AlienSkin in 2007, and then as a reprint in the e/print magazine Aoife's Kiss in the December 2009 issue.