"Chinese archaeologists have discovered a group of ancient tombs shaped like pyramids, dating back at least 3,000 years, in Jiaohe City of northeast China's Jilin Province. The tombs, covering an area of 500,000 square meters (1,000 meters long and 500 meters wide), were found after water erosion exposed part of a mountain, revealing two of the tombs. Six smaller tombs had eroded away leaving no indications of their original scale and appearance, but the biggest tomb, located on the south side of the mountain, could clearly be discerned as a pyramid shape with three layers from bottom to top." (From Xinhua news service - Link; via warrenellis.com)
Part of the Jiahoe complex -- image from UNESCO.
Here's a page on other Chinese pyramids, mostly near Xi'an (link).