I will look up that website. Meanwhile, try this one: go to ebay and search "chicago postcards". There are hundreds of views of old Chicago, and all are for sale.
Calumet412 is pretty interesting. Haven't even gone through it all, but what Ive seen is excellent. Also Chicago Daily News photos up to 1930 has been around for a while and also a must see. Cushman also has great color shots from the forties up. All can be googled. And well worth it.