The Julia Donaldson poem reminded me of this poem by Emily Dickinson. The concept of escape through books and the widening of horizons by reading is clearly set out in this short piece that first appeared in a letter to a friend rather than in a volume of poems.
There is no Frigate like a Book
To take us Lands away
Nor any Coursers like a Page
Of prancing Poetry-
This Traverse may the poorest take
Without oppress of Toll-
How frugal is the Chariot
That bears the Human soul.