I am trying to locate a GPS that has driving maps of the world, not just usa and europe that can also be used to find tourist attractions around the world. What is this gadget and where can I buy it?

My husband and I travel a lot and many times we wander around and don’t have specifics of things to see in each area. Sometimes we rent a car and drive, sometimes we walk. I want to be able to see things indigenous to the area, not just what the tour guide recommends. What gadget can help?