Most of the times when I travel alone, one thing that bothers me is that who will take my photographs. So at times my only reason to take someone along with me is ...huh! you're right. :-)
Taj Mahal from a few meters far away looks heavenly. However, once you are in, you'll lose your interest. The inside of Taj Mahal is not lit. And these days you have to be in a queue and the queue is rushed inside out - given that they close entry by sunset. I remember my friends who visited Taj Mahal say that they would sit there for hours, and that it was a common place to idle your time. The atmosphere there any time you go is appealing to senses. If you're in India, and you have not seen the Taj Mahal, you have seen nothing.