This website allows you to locate a public toilet in 19 countries (The United States, Australia, New Zealand and the rest are in Europe) and obtain detailed information about the quality of the facility. Some entries have photos and even provide the longitude and latitude for Geo Trackers.
I’m not sure how accurate the information on this site is or even how useful you'll find it, but it’s still interesting to see who’s sick in the US and what they’ve got (runny nose, cough, fever, headache). If you’re a hypochondriac, then you can avoid traveling to these disease-infested places. Ha Ha HA!