Consider, for example, the Japanese stone circles from Ōyu and Isedotai in northern Japan. While not the imposing monoliths of Stonehenge, the two circles, made of thousands of smooth river stones, line up with the sun during the summer and winter solstices, and they were both used in burial rites. And for both monuments, collecting materials and completing construction would have taken enormous community effort. The similarities could also be related to topography: Japan and the United Kingdom are along the same latitude, sharing a similar climate and access to natural resources. But while the Neolithic people living near Stonehenge...