The Three Pagodas of the Chongsheng Temple are arranged on the corners of an equilateral triangle, near the old town of Dali in Yunnan province, dating from the time of the Kingdoms of Nanzhao and Dali in the 9th and 10th centuries.  This card seems to have been mailed in 1988, with two different stamps, postmark, and an honestly inconspicuous thumbtack hole at the top.  Grade: 4