Not just a website… a government maintained website! http://www.toiletmap.gov.au/
I encountered this while browsing for camping sites around South-East Queensland.
It’s done by a project as part of the “National Continence Management Strategy” of the Australian federal govt department of Health and Aging. There ya go… ;-)

I always tell people that Australian govt is quite good with providing online information, forms, and online services… but this probably takes the cake so far. Mind you, it’s an excellent and useful service.
In places like the Netherlands and Germany, you often have to pay for use of these public facilities.

(note for American readers: a toilet is a toilet. Everyone uses them [one hopes]. It is not an offensive word that requires euphemising (yes I made up that word). It’s not a bathroom, which as the name suggests has something to do with bathing (washing), and often does not facilitate a toilet at all. Thank you.)