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Each button is one printed USGS map sheet. Move the map and tap “Map years here” again to see other sheets.
Anywhere in the U.S.: look for town names, building marks, mines and roads on the old layer that are gone today. Tap the map for coordinates, to drop your own pin, or to open that spot on HistoricAerials.
Removing artifacts or metal detecting on public land (state parks and forests, national forests, BLM land) is often banned or needs a permit. Check the rules first, then look and photograph and leave things in place.