If you don't mind some small holes, you can put small nails into the mortar area of a brick or stone front. If the item is heavy, you may need to drill with a masonry bit and use a concrete screw that can hold more weight. And if you don't want to make/repair any holes, then look for flat areas of wood trim or siding that you can attach a command hook to instead, or simply hang things from the door frame only.