# Accessing third-party maps of Chicago - [Henry Hart's map of buildings in the City of Chicago, 1853](https://iiif.lib.harvard.edu/manifests/view/ids:7349746). This map also acts as a ward map for the period. - [1868-69 fire insurance maps](https://chicagoinmaps.com/prefireindexmap.html) on Chicago In Maps, a website operated by Chicago Cartographics and Dennis McClendon.