Madison Information Station is a compact visitor center and historic trailside museum just south of Madison Junction, roughly halfway between West Yellowstone and Old Faithful. Stop for park information, public restrooms and the Yellowstone Forever bookstore; the building gives this practical break a bit more character than a standard pull-in. It works best as a quick stop, not a long museum visit.
The station's services are seasonal, and staff may not always be present even when it is open. Check the current schedule if you need in-person help or the bookstore, and plan food elsewhere. It sits on the Grand Loop Road, but the park notes that Madison can be approached from two directions, so check your map near the junction.