Attach photos to a resume? Is this a common thing to do in the US?
It's rather common apparently in Europe though, even expected in some countries, like Germany.
On the subject of "crazy things about job-hunting in Europe," I recently learned that in France, it's expected that you hand-write your cover letter, and HR departments employ people who supposedly can figure out a person's personality and work ethic based on their handwriting.
I can't think why anyone would want to include a photograph of themselves on an application / CV / resumé.
I've taken a bunch of photos for friends for use in their applications. And it's always the same: if they are shy and introverted, they do look like this in pictures. Same applies to extroverted characters.
As far as I know, it's still standard practice throughout most of Asia.