ExploreBig: Montana’s Historic Places is a free mobile app to help you discover Montana’s rich cultural resources. Curated by the Montana Historical Society, ExploreBig shares the history and architecture of selected buildings, neighborhoods, and cultural sites listed on the National Register of Historic Places, the nation's official list of cultural resources deemed worthy of preservation. The app’s mobile markers reproduce National Register signs placed at the sites themselves as part of a program, funded through the state’s accommodations tax, to improve public knowledge and promote historic preservation.