Image: Oldest geothermal
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Description: The oldest known hot spring pool, built in the Qin dynasty in the 3rd century BC. It was found in an archeological dig under the HuaQing Chi （华清池） resort on Lisan mountain, China.
Title: Oldest geothermal
Credit: Own work
Author: Ytrottier
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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