There's some sites that just keep you coming back. Me, I could spend hours on urban sketchers.com. With drawings from all over the world, it's like globe-trotting with a new artist's perspective at every turn. Here's some of my favorites but definitely check out more on their site.
This one is from Ukraine, it reminds me of an old painting my uncle did of the homeland..
... And you know I have to throw in a brooklyn one.