Barrows are a prominent feature of Britain's Bronze Age landscape. While they originated as burial monuments, they also appear to have acquired other roles in prehistory. British prehistorians, however, have been hampered in their interpretations of these monuments, as they are wary of speculating about how Bronze Age people might have conceptualised their dead. Here, the authors suggest that a recurring pattern of inversion is significant. They use Conceptual Metaphor Theory to argue that Bronze Age people in Britain saw their dead inhabiting an inverted underworld directly beneath the surface of the earth. This interpretation would explain not only burial practices, but also some of the barrows’ other apparent functions, such as guarding boundaries and controlling routeways.