@ancientorigins
Spoiler: It's completely NATURAL.
Sandstone just does that all on its own.
If you still have any weird-woowoo-von-Däniken-esque doubts about this then visit Orkney where you'll see this stuff ALL OVER PLACE, much of it no longer underwater so you can actually look at it up close and touch it.
It's just what rocks do.
#geology #woowoo #Japan #Orkney #science #archaeology #NotArchaeology
:-)