One of the loveliest Christmas presents I ever got was How the Heather Looks: A Joyous Journey to the British Sources of Children's Books by Joan Bodger. I spent a day reading this book which literally took me away to another place and time--England in the late 50s early 60s. I enjoyed Bodger's descriptions of traveling with children which rang so true with me: keep them fed, find a place to do laundry.
What are some other titles of travel books that have children's books as the theme?