Along the trail there are actually two burial mounds (古墳 kofun) with the name "Tsukuriyama" that can be distinguished only when viewing the characters used to write the names. The tomb on the Okayama side of the trail (造山古墳) is the most interesting. This burial mound, believed to have been completed in the fifth century, was the largest in the nation at the time it was built. Because the tomb within the mound has never been excavated, it is not certain who is actually buried here; however, it is believed to be one of the former rulers of the Kibi Kingdom, as tombs of this size were reserved only for those in the highest positions. Although the best view of Japanese burial mounds is always from above (to see the key-hole shape), at this mound, visitors are actually permitted to walk on top of it. Atop the mound there is a shrine.