Horrible but True Natural World History Odd Events and Disaster History's Tyrants Castle Secrets Last Rites Crime And Punishment Exploration Unusual Events	Tombs of Treacle In Boston, USA, 21 people were killed in 1919 by a 9-million-litre tank of molasses that burst and engulfed 8 buildings.   Previous: Back Book: Horrible but True Section: History Chapter: Last Rites