Tattooing has been a Eurasian practice at least since Neolithic times. Mummies bearing tattoos and dating from the end of the second millennium BC have been discovered at Pazyryk on the Ukok Plateau. Tattooing in Japan is thought to go back to the Paleolithic era, some ten thousand years ago. Various other cultures have had their own tattoo traditions, ranging from rubbing cuts and other wounds with ashes, to hand-pricking the skin to insert dyes.