Of Christiansborg Palace's numerous museums (which include a theatre museum and an arsenal museum), the cake-taker is De Kongelige Repræsentationslokaler , an ornate Renaissance hall where the queen entertains heads of state.
Beneath the building lurk the Ruins of Bishop Absalon's Fortress , the excavated foundations of Bishop Absalon's original castle of 1167 and of its successor, Copenhagen Slot.