Two cool things:
Wikimedia Commons recently added the ability to add tags to images, and…
I recently discovered that the U.S. National Atlas and the U.S. Census Bureau have online mapping tools that let you build custom maps; and because they’re made by the U.S. government, you can then upload the results to Wikipedia, etc. Pretty cool!
Here’s an example. Click on it to see it on its Wikimedia Commons page, where you can view the tags. Go ahead and do it — there are some fun surprises!