I recently stumbled across Retronaut and had to share it. The site, maintained by English blogger Chris Wild, is a collection of historical photos, videos and written content. Chris states "I have always wanted to go back in time and I was constrained by the practical difficulties of doing that." Indeed. Well, he has done his best to time travel through creating his digital time portal of historical content.
The content on Retronaut is categorized by decade or you can search by category. And although the site is based in Britain, the photos cover world-wide topics.