I've said a few times before how the real world is such an amazing place. If it weren't for all this reality, I don't know where I'd get 90% of my ideas.
A great website I found long ago is http://phototravels.net/
It's a huge photo dump of places from all over the globe. It's both easy and difficult to wade through because I might be looking for cool jungle shots and end up lost amidst waterfalls and desert rock formations.
Definitely worth several hours of gandering.