The Royal Armoury is one of the palace's best museums - don't miss it. Sweden's oldest museum, which was founded in 1633, is stuffed full with armour, weapons and clothes from the 16th century onwards, and is housed in the palace's former cellars, which were used for storing potatoes and firewood. With wonderfully descriptive texts, the museum's first room shows what a bloody and dangerous business being a king once was. It contains the masked costume King Gustav III wore when he was assassinated in 1792, and the stuffed body of Streiff, the horse that Gustav II Adolf was riding when he was killed in battle in 1632. Don't overlook the glass jar preserving the stomach contents of one of the conspirators to Gustav III's murder. Other rooms display splendid mounted knights, suits of armour, swords and muskets. Two rooms of clothes and toys - including a miniature carriage - describe the lost childhoods and early responsibilities of the royal children. The ceremonial coaches of the nobility lie beneath the main floor, in another hall. Guided tours in English are no longer given, but audio guides in English are provided for 20kr.