Dunstable Downs, a chalky escarpment outside the town, is a popular site for kite flying, paragliding and hang gliding, while the London Gliding Club provides a base for conventional gliding and other air activities at the bottom of the Downs. Further into the countryside are the open-range Whipsnade Zoo, a garden laid out in the form of a cathedral at Whipsnade Tree Cathedral and the Totternhoe Knolls motte-and-bailey castle.