Mochi Hidden America

Every place on the National Register of Historic Places — 90,180 of them — on your phone, and the map works with no signal at all. Hidden America is an atlas of the listed places around you: the buildings, districts, ships, battlefields and archaeological sites the United States decided were worth keeping. It ships with the whole Register inside it, so browsing, searching and the map all work in aeroplane mode. Add your own Anthropic API key and it becomes something else — a guide that reads a place's federal record and the archival photographs matched to it, and tells you what actually happened there. THE WHOLE REGISTER, ON THE DEVICE Both public layers of the National Park Service's data: individual listings and mapped historic districts, 90,180 places including 2,429 National Historic Landmarks. Nothing is fetched to draw the map or run a search. BROWSE WHEN THE MAP IS EMPTY Most of…