The picture shows one of the gallows on which the Spanish conquerors strung up the natives of Hispaniola en masse and burnt them alive according to the account of las Casas.
Theodor de Bry (1528–1598), copperplate for the first Latin edition of Bartolomé de las Casas, Brevísima relacion de la destrucción de las Indias (Narratio regionum Indicarum per Hispanos quosdam devastatarum verissima, Frankfurt 1598); source: Wikimedia Commons, http://commons.wikimedia.org/wiki/File:De_Bry_1c.JPG, public domain.