Near Notre Dame Cathedral and the Seine (River). They are eco-friendly open-air urinals. Leave it to the French to lead the way once again! Allons enfants de la patrie! :)
Never having traveled to exotic places I am ignorant of poop/pee protocol in foreign lands. As for your comment about the homeless in the US pooping wherever they happen to be I agree with thee it would be better to have a pot to pi** as well as some receptable for the other number. Thank you for your thoughtful and eye-opening reply Shuhak. I have led such a sheltered life! :)