The Imperial Palace in Carthak is a very grand building, and is the main residence of the imperial family of the country. The palace sports many halls, rooms, gardens, and even a menagerie.
The Hall of Bones is where skeletons of ancient creatures were put on display. In 452 HE, Veralidaine Sarrasri awoke these creatures using magic from the Graveyard Hag. She destroyed the palace, and it had to be rebuilt during Emperor Kaddar's reign.
Carthaki soldiers are forbidden from entering the palace grounds in order to prevent a military coup d'état.
More information on the Imperial Palace will probably be featured in the second and third books of the Numair Chronicles trilogy.