Recently in Flickr I came across the Commons initiative. Its basically a set of galleries with some of the best world's public photography archives! You can easily get lost there just browsing through!
One of my favorites is the Nickolas Muray gallery from the George Eastman House's,
These are some colorful and full of joy pictures!
This is just a wonderful gallery of many! I also found out that one of the Portuguese institutions involved is the library of Calouste Gulbenkian foundation. How cool is this! although far away i can still enjoy their photography archives!
here are our famous trams! And this one goes directly to my home! :)