Ridges and furrows created by ploughing to reduce noise caused by runways:

http://www.wired.com/2014/06/airport-schiphol/
http://www.landscapethejournal.org/Ridge-and-furrow
http://www.schiphol.com/Travellers/News/BuitenschotLandArtParkEnjoysFestiveOpeningWorldFirstInGroundnoiseReduction.htm
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