The Revolutionary Monument was a monument constructed in Steelhold to commemorate the Marble Faction's revolution of 258. It was comissioned by Emdief Twiceborn as the last act of his reign, but was not completely smoothed until the reign of Corley.
Though the monument looked good on paper, since it reached the ceiling of the room it was built in, nobody could actually see it. In addition to this, it served absolutely no practical purpose, not even as a route from one section of the fortress to another. The real significance of the monument is probably that after the Faction's fall, few could afford to waste the dwarfpower building something like it again.