To get you started

American Restroom Association

World Toilet Organization

Photo source https://www.worldtoilet.org/rainbow-school-toilet/

Norway

https://www.visitnorway.com/plan-your-trip/travel-tips-a-z/norwegian-scenic-routes/worlds-best-toilets/

The public toilets reopening in Cambridge city centre this weekend:

https://www.cambridge-news.co.uk/news/cambridge-news/public-toilets-reopening-cambridge-city-18530499

Venice Italy

https://europeforvisitors.com/venice/articles/public_toilets.htm

Carry change for toilets, which often have turnstiles at the entrances. Public WCs of AMAV, the Venice sanitation authority, charge a mind-boggling €1,50 unless you have the Venice Connected pass. Larger museums (such as the Doge’s Palace) have attended restrooms with posted fees. In other museums and galleries, toilets are often free.

Malaysia

https://says.com/my/imho/please-stop-doing-these-in-public-toilets

India

https://www.financialexpress.com/lifestyle/swachh-bharat-condition-of-public-toilets-continues-to-be-dismal/1692405/

The Portland Loo