During the first class, Wicklund will cover different sources and resources, both in person and online, that people can use. These might include places such as the Chicago History Museum, which has photos of homes and neighborhoods dating back to the 1870s — although he cautions that specific photographs can be difficult to locate — or the city’s Department of Buildings website, where people can search by address to reveal previous building permits and violations. Some historical building permits from before 1950 are also available through the University of Illinois at Chicago, Wicklund said.