“The ruins of an ancient Chinese watchtower from the Han Dynasty (202 BC to 220 AD), located along what was the old line of rammed-earth fortifications in
Dunhuang, Gansu province, China, that once stretched from the Hexi Corridor (in Gansu) to the Tarim Basin (in modern Xinjiang).”
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[image source 2010-01-20 http://en.wikipedia.org/wiki/File:Summer_Vacation_2007,_263,_Watchtower_In_The_Morning_Light,_Dunhuang,_Gansu_Province.jpg ]
Dunhuang has Singing sand.
To hear it, see this video:
