Sword of Spirit
Legend
Back in the day the same character ventured into the caves of chaos, then into the unknown, defeated the Slave Lords, solved the mystery of the ghost tower of Inverness, released Strahd from his curse, slew the hill giant chieftain, entered the desert of desolation etc. it felt like your character had numerous different stories to tell when they finally retired at 18th level.
That's what I consider a real D&D campaign. It saddens me that most newer players have never even heard of such a thing, much less had the opportunity to give it a shot and see if they like it.