City in Uttar Pradesh, India, famous for the Taj Mahal (4)
I believe the answer is:
agra
(Other definitions for agra that I've seen before include "City famous for its Mogul architecture" , "Foreign city" , "Indian city, capital of the Mogul empire until 1658" , "Site of the Taj Mahal" , "Site of the TajMahal" .)