I don't know if you've ever come across the website Retronaut or not, but I must advise you go check it out. Retronaut is kind of like Pinterest, but just for photos of all things history. It's amazing, you can see anything from Johnny Cash sitting in a bush eating a whole cake to "Dead Head" Hitler Postage Stamps. It has so many fascinating images, you literally can get lost in this site. I really like how they have the website set up, too. When you click on an image it brings a lightbox up with the photo and to the right it has category, URL, era, source, and favorite buttons, and on the bottom it has "If you like this, check out:" suggestions. Sometimes the collections have multiple photos.
Best part: You get to curate collections by adding your own little pieces of history. How awesome is that?
Below are some of my favorites which can be seen in my Favorite Capsules.