Picture Australia, hosted by the National Library of Australia, is a wonderful archive of photos, objects, maps and works of art making it a rich source of local and national history.
You can add your own story to Picture Australia by uploading your pictures to Picture Australia via Flickr. Find instructions on how to do this here.
Why not start with some photos recording your activities on Australia Day, coming up this weekend.
If you're interested in US history, you'll be delighted to know that the Library of Congress has now begun to display some of its vast photographic collection on Flickr.