If you sail to the island of Sanday in the Orkney archipelago in northern Scotland, you’ll see the silhouettes of neighboring islands on the horizon. Upon arrival you’ll see white, sandy beaches that trail into rough, once-agricultural terrain, and experience its erratic weather—sun then fog then rain then clear skies all in the same day. Nestled there, on a shallow cliff, is a mound of earth and rocks: a prehistoric tomb dating to around 3500 B.C. The tomb sits on a low-lying peninsula, where growing storms and agitated seas are…
