The mysterious Tonkararin tunnels in Japan and the myth of the concealment of the goddess Amaterasu

In the Japanese mountains lies a mysterious network of megalithic tunnels known as the "Tonkararin tunnel". With a millennial appearance, it is thought that they were excavated between the Yayoi and Kofun periods. Some speculate that the tunnel is actually a sort of Shinto shrine, used in certain rituals connected to the nearby Eta Funayama burial mound, but the folkloric tradition of Nagomi makes it the mythical hiding place of the goddess Amaterasu.