http://consumeconsume.com/
  http://www.reddit.com/r/AskHistorians/
  http://thesocietypages.org/socimages/
  http://www.contemporist.com/
  http://randomghost.tumblr.com/

Contemporist currently showing errors and occasional CloudFlare messages - load issue? It's architecture/interiors/furniture.

If you like futuristic concepts, Random Ghost and its infinite scroll will eat your day. It's amazing.

Consume Consume is an incredible mixture of bizarre, awesome or amusing images. A good, occasional break from the grind.