Is this perhaps the most suitable wonder for the Xiongnu? https://en.wikipedia.org/wiki/Noin-Ula_burial_site "one is an exceptionally rich burial of a historically known ruler of the Xiongnu, Wuzhuliu, who died in 13 CE" https://link.springer.com/article/10.1007/s10814-011-9053-2/figures/3