Where Kubla Khan decreed 'a stately pleasure-dome' (6)
I believe the answer is:
xanadu
(Other definitions for xanadu that I've seen before include "where pleasure-dome was planned" , "Coleridge's site of Kubla Khan's pleasure-dome" , "old Chinese summer capital" , "Winter palace of the Kubla Khan, according to Coleridge" , "Idyllic location" .)