Google plus does in fact allow photos/albums (maybe posts? I haven't checked) marked "public" to be viewed by anyone with the url.
Here are the first 99 photos from my trip to Death Valley last month, for example: https://plus.google.com/photos/114127672767084904209/albums/5718366559408412705
"It ain't so much the things we don't know that get us in trouble. It's the things we know that ain't so." -- Artemus Ward aka Charles Farrar Brown