I love the Denver Post's Photo Blog. The quality of pictures they share as well as their highly relevant topics make their site one of my all time favorites. In 2009 they published a collection of 73 pictures about the Berlin Wall to commemorate the 20th anniversary of the Wall's collapse. A with everything published by the Denver Post's photo blog, the pictures are spectacular. I encourage everyone to take sometime to look through this important part of world history at the Denver Post's Photo Blog.
Next there is the Denver Post's Photo Blog about the Statue of Liberty. This post was published in 2011 for the Statue's 125th anniversary. It features pictures from the creation of the Statue of Liberty as well as many rare pictures of the Statue over its 125+ years of existence.
Finally there is this post from Denver Post photo blog. It is a photo gallery of 77 pictures of American cities before 1950. Many of the pictures are from the 19th century and go as far back as the Civil War era. These pictures are a "must see" for history buffs and fans of old photography.