What places or things do you think are a treasure trove of germs?

I’m not a germaphobe, but I got a bad stomach virus and was trying to figure out where I may have picked it up. As I went shopping I saw someone sneezing all over their grocery cart handle. Then it dawned on me that at times, I have touched sticky handles. It got me wondering how many things we touch and never think about it. Handles on doors is probably the most popular but a lot of doors are automatic these days or you can easily use your elbow to push. Anything in a bathroom as well but most places at least clean them once or more a day.
What do you think probably never gets cleaned and we touch all the time without thinking about it?