SepiaTown = Historical Photos + Architecture

This website called SepiaTown, allows registered users to upload scanned historical images of architecture and map them. Visitors see thumbnails of the images on a map. You can click on the thumbnail to bring up a full image with information and then click on that image to get a larger one, which is big enough to use in PowerPoint. Note that, on the page with the smaller full image, there is a box towards the bottom with a permalink. This is good to note in the image title, PowerPoint notes, or elsewhere so that you have a record of the image source.