Mausoleum built by the emperor Shah Jahan in memory of his favourite wife (3,5)
I believe the answer is:
taj mahal
(Other definitions for taj mahal that I've seen before include "Mausoleum at Agra in memory of a Mogul wife" , "Indian tourist attraction" , "Mausoleum of Mogul empress" , "Agra memorial" , "Famous Indian mausoleum in Agra" .)