answer:Be more specific. Is it the history of a building in a city in which you live? If so, then go the the city/county/state office of deeds and records and also go to the government office where they keep recorded plats and plans required for building permits. Also Historical Societies and Historic Preservation groups. You will also have [sometimes] the pleasure of holding the original drawings in your hands.I have had to do this for legal research—finding out who sold what plot of land to whom and how it was subdivided and who then sold what to whom. Also on record are such things as major renovations, conversions, etc. For history of the persons involved the digging goes deeper. I am about to pursue this again through Historical Preservation Societies for structural and design details over the years.