Gargi, regarding your first question, it's hard to say - I can't say I've ever been sufficiently in love to go to that degree of extremes in order to memorialize that loved one, so I couldn't say what I would do if someone that close to me died.
I think my favorite Taj trivia was just learning the history of the Mughal dynasty, the decadence of the kings and the remarkable acceptance with which the first three Mughal emperors treated their subjects.