Which bank does not charge at all for using the ATM?

Excuse me, I'm just curious, do you happen to know which bank offers the service of using their ATM machines without imposing any fees on their customers? I've been trying to find one that doesn't charge for transactions, but it seems like most banks have some kind of fee attached. Is there a specific bank or maybe a credit union that offers this kind of service? It would be really helpful if you could point me in the right direction. Thank you in advance!