Featured on PDR in the essay From Fire Hazards to Family Trees: The Sanborn Fire Insurance Maps

Created for US insurance firms during a period of devastating fires across the 19th and 20th centuries, the Sanborn maps blaze with detail — shops, homes, churches, brothels, and opium dens were equally noted by the company’s cartographers. Tobiah Black explores the history and afterlife of these maps, which have been reclaimed by historians and genealogists seeking proof of the vanished past.