Archaeologists, planners, architects, and urbanologists alike all enjoy a good fire insurance map, and this excellent digital real estate atlas collection from the New York Public Library will be one that they will want to visit repeatedly. This collection brings together real estate maps created by William Perris who surveyed Manhattan and Brooklyn extensively during the 1850s and 1860s. The maps are commonly known as fire insurance maps and they detail streets, blocks, tax lots, the locations of former streams, various natural resources, lot lines, and much more. That's far from all, as the collection also includes atlases of Staten Island from 1874 and atlases of the Bronx from 1921. For anyone interested in urban history or New York City, this collection will prove indispensable.