Citadel City is the fourth hub in Crash Team Racing. It is also the final secondary hub world in the game. The boss for Citadel City is Pinstripe Potoroo, who can be challenged once all sixteen trophies are collected before the player faces Nitros Oxide. This world houses some of the game's hardest tracks.
It is also possible that a link between Citadel City and Cortex Castle may exist due to the Neo Cortex Airship which can be seen from a ledge within Citadel City. Or, Citadel City itself was abandoned castle from medieval era during Crash Bandicoot: Warped.