<P> In 1999, physical evidence of lion cages was found, one being 3x3 meters (6.5 x10 feet) in size, very small for a lion that can grow to be 2.5 meters (approximately 8 feet) long . In 2008, the skulls of two male Barbary lions (now extinct in the wild) from northwest Africa were found in the moat area of the Tower . Radiocarbon tests dated them from 1280--1385 and 1420--1480 . During 2011 an exhibition was hosted at the Tower with fine wire sculptures by Kendra Haste . </P> <P> Anne Boleyn was beheaded in 1536 for treason against Henry VIII; her ghost supposedly haunts the chapel of St Peter ad Vincula, where she is buried, and has been said to walk around the White Tower carrying her head under her arm . This haunting is commemorated in the 1934 comic song "With Her Head Tucked Underneath Her Arm". Other reported ghosts include Henry VI, Lady Jane Grey, Margaret Pole, and the Princes in the Tower . In January 1816, a sentry on guard outside the Jewel House claimed to have witnessed an apparition of a bear advancing towards him, and reportedly died of fright a few days later . In October 1817, a tubular, glowing apparition was claimed to have been seen in the Jewel House by the Keeper of the Crown Jewels, Edmund Lenthal Swifte . He said that the apparition hovered over the shoulder of his wife, leading her to exclaim: "Oh, Christ! It has seized me!" Other nameless and formless terrors have been reported, more recently, by night staff at the Tower . </P>

What was the purpose of the tower of london