Remains of the old tennis courts at the American Camp Schiel rest camp, to the east of Kunming at the north end of Yangzonghai (阳宗海) lake, in 2007. (See a historical image of the tennis courts here.) At that time the rest camp had recently been abandoned by the PLA, who had used it for many years. Many of the buildings and pathways were the original structures from the WWII era (including at least the location of these overgrown tennis court, if not even the concrete). In another visit in 2015, it seemed the rest camp had been torn down.
Image by Patrick Lucas.