TreeAlive maps family trees. When a visitor's ancestors lived in California, the landmarks registered near those places surface automatically alongside their family's journey:
Fort Ross · near where a family lived on the Sonoma coast in the 1840s · founded in 1812 by Russians from Alaska, and when they withdrew in 1841 Captain Sutter bought the improvements and supplies
A landmark stops being a roadside stop and becomes a destination with a personal reason to visit. Open the live demo tree, choose the Crossings tab, and turn on Historical Markers to see the experience working (the demo family’s markers are in Pennsylvania; a California family sees California’s).