An important aspect of the refurbished Brewhouse is the Treasury gallery on the first floor. This purpose-built display area has given the opportunity for a series of special exhibitions that focus upon areas of the Collection that cannot usually be displayed in the staterooms.

In recent years there have been exhibitions of the world famous Burghley collection of Chinese Snuff Bottles, rare Japanese Kakiemon ceramics and a stunning group of treasures from the Elizabethan period.