Historical images are increasingly made public online through the Internet. Museums, libraries, and archives can all be great places to find public domain historical images and primary sources. In addition, some sites, like Flickr and Internet Archive, compile images from multiple institutions. See the Finding Images guide for a comprehensive overview of general sources, copyright considerations, and citing practices.
Locating relevant images can be tricky, depending on the extent of descriptive metadata that has been provided for the image. Every institution has their own standards and terminology preferences. Sometimes browsing images (instead of keyword searching) within smaller collections through the use of filters can have great advantages. However, when keyword searching try using just one or two keywords related to:
Try to think of the labels or tags someone might put on an image related to your topic. Consider synonyms as well as broader and narrower terms.
For images in the public domain, see: