Built in 1906 by the son of W.H . Smith of book-selling fame , Bovey Castle , -LRB- 44-1647 -RRB- 445-016 , www.boveycastle.com , in Dartmoor National Park in Devon , England -LRB- a two-hour train ride from London -RRB- , was bought by the entrepreneur Peter de Savary two years ago and transformed into an English country playground for all ages .