Replica of one of the excavations, three-head fuddling cup
seemingly used for offering holy sake to God.
Takemoto-san made it with pottery, his another hobby.
Takemoto-san's collections of excavations.
The photo of stone coffin when excavated.
The site where above stone coffin was discovered.
According to Takemoto-san, this mound also was a tomb.
An example of the road cutting the tomb.
The site is not open to general public, but Takemoto-san took us specially.
The stone seemingly used for closing the hut bore the coffin.
The tomb has the remain of moat, seemingly belonged to higher-rank person.
People in later times erected tombs; seemingly warriors fought against Mongolian invaders.
The site is called Shimbaru One-Hundred Wodden Memorial Boards.
Some boards have Sanscrit scripts (Juutai Shigoku Bonji [Sanscrit].)
Takemoto-san in front of Site 22.
People in later times considered the tomb holy and built a shrine in it.
Driving down the mounded tomb site.. :)
I found a couple of more interesting pages where we can learn better about
Shimbaru-Nuyama Mounded Tomb Group.
Fukuoka hosts ICOMOS Annual General Assembly and Advisory Committee - Asahi Shimbun
Series -- Japan's World Heritage Site: “Sacred Island” of Okinoshima and Associated Sites in the Munakata Region
【福岡】福津市の新原・奴山古墳群 - Y氏は暇人
Also see on ASKSiddhi -
Munakata, Mounded Tombs, and Holy Clan Connected Japan and Continent
Shimbaru-Nuyama Mounded Tomb Group, The Prologue
Photo Tour to Shimbaru-Nuyama Mounded Tomb Group