ShotHotspot has mapped 24 abandoned places in Cumberland, Maine, ranked by how often they're photographed, viewed and voted for. The most popular are Androscoggin River from Bay Bridge Landing, Bates Mill Maine Abandoned and Wall Mill Cowan Abandoned. Some are private property or unsafe, so get permission before you visit.
We don't know whether you're allowed to visit any of these places. Many are private property, closed to the public or unsafe: get permission from the owner or the relevant authority, and take safety precautions.