Do you know that there are faery hills in the Celtic countries, where humans are said to be taken into the faery realm for varying lengths of time? Children are traditionally warned about faery dwellings lest they be spirited away, because the faery folk love the open nature and innocence of children. Sometimes a human will pass into the faery realm for what seems (to them) like a short time, but when they return to the world of mortals hundreds of years have gone by.
Come away, O human child!
To the waters and the wild
With a faery, hand in hand,
For the world’s more full of weeping than you can understand.