I second "Return to Wonderland".
Also I second "The Alchemyst".
I' like to nominate "Puck of Pook's Hill" by Rudyard Kipling, available here
Dan and Una, brother and sister, living in the English country, had the good fortune to meet with Puck, alias Robin Goodfellow, alias Nick o’ Lincoln, alias Lob-lie-by-the-Fire, the last survivor in England of those whom mortals call Fairies. Their proper name, of course, is ‘The People of the Hills’. This Puck, by means of the magic of Oak, Ash, and Thorn, gave the children power
To see what they should see and hear what they should hear,
Though it should have happened three thousand year.
The result was that from time to time, and in different places on the farm and in the fields and in the country about, they saw and talked to some rather interesting people. One of these, for instance, was a Knight of the Norman Conquest, another a young Centurion of a Roman Legion stationed in England, another a builder and decorator of King Henry VII’s time; and so on and so forth...