This Arizona courthouse, however, keeps one remarkable piece of history several floors above the busy streets below. A restored jail cellblock survives on the sixth floor, complete with heavy doors, narrow corridors, and spaces that once held real prisoners. The Restored 1929 Jail CellblockWalking into this space feels like the building itself is whispering stories from nearly a century ago. The restored cellblock on the sixth floor of the Historic Old Courthouse operated as a working jail from 1929 until the 1960s, and the museum has preserved it with remarkable care and attention to detail. The Historic Old Courthouse Building ItselfBefore you even reach the museum on the sixth floor, the building you are entering deserves a slow, appreciative look.