The Gaol was a prison in the City of the Saved where Adolf Hitler was kept as punishment for the suffering caused by his actions. It was a four-story concrete tower surrounded by an electric fence on the centre of an island. The tower had tiny slits for windows. Millions of people killed during the holocaust guarded the tower, refusing entry to everyone seeking to meet Hitler.
Marcus Americanius Scriptor once visited the Gaol wishing to see Hitler. Like everyone else, he was turned back and told to return when Hitler finished serving his sentence of six million lifetimes. (PROSE: Warlords of Utopia Prologue)