Sara Wheeler reflects on the valuable perspective offered by out-of-date guide books. They shed light on the life of the early traveler - advised to pack an iron bedstead and a portable bath tub - and reveal how destinations may have evolved or be frozen in time.

'The chief question I ask the old guides is whether the spirit of a place - the genius loci - can survive the upheaval of the years. Is the spirit of the place immutable or can it change?' asks Sara.

Producer: Sheila Cook
Sound: Peter Bosher
Production Co-ordinator: Liam Morrey
Editor: Richard Fenton-Smith