Nobody checked our cdc cards in Rome. Very few masks in Rome

We flew from Texas on Sunday on American Airlines. They checked our cbc cards. Very few masks in the airport. A few people including me wore masks off and on the plane. Landed in LHR on Sunday. Very few masks in the airport. They checked our cdc card when we checked in for our BA flight to Rome. Very few masks in Rome including the Vatican and it’s museum. Nobody checked the cdc cards any where in Rome. We checked in for our flight to Athens today. Nobody checked our cdc cards at the airport. More masks in the Rome airport. They announced at our gate that you have to wear the mask on the plane.