Fairyland

Fairyland was a place mentioned by the Eleventh Doctor. When Lily Arwell expressed her belief that an unnamed planet was "Fairyland", the Eleventh Doctor told her to grow up, because Fairyland looked completely different. (DW: The Doctor, the Widow and the Wardrobe)

Other references
When Alistair Gordon Lethbridge-Stewart asked the Eighth Doctor if Avalon was Fairyland, the Doctor answered "Sort of." (EDA: The Shadows of Avalon)

Prior to this, the Eighth Doctor had traveled to a Fairyland of a different sort, the home of the Sidhe. (EDA: Autumn Mist)

Jack Harkness and Torchwood Three had an encounter with members of the fairy race as well. (TW: Small Worlds)