The Invisible
From Tardis Wiki, the free Doctor Who reference
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)
The realm of the fairy race that Jack Harkness and Torchwood Three encountered was called the Lost Lands. (TW: Small Worlds)
