My teacher showed a photo similar to this one in class the other day. He was trying to get us to understand the horrible living conditions in cities during the 1800s, and how the culture reflected the city lay-out. That's fascinating.
But all I could really think was:
Man.......thank you photographers. For preserving the world through capturing moments that become history.
I follow National Geography on Instagram. The brilliance of the world in its pure form. There is beauty in this world. We've just got to find it.