Pieter Bruegel the Elder (ca 1525-1569), The Triumph of Death (ca 1562), oil on wood, detail 2.
Museo del Prado, Madrid.

(Source: Wikimedia.org)

In the centre of the painting, Death on horseback, waving a scythe, his typical attribute, drives the living crowd into a rectangular tunnel, so as to send them straight to their deaths. On either side of the tunnel entrance, skeletons holding coffin lids as shields with the sign of the cross, preclude any escape possibility. Bruegel's representation of people being rushed into a collective death inevitably reminds us the Nazi mass extermination.