107 REASONS WHY - the Taj Mahal isn’t islamic, it’s a Hindu Temple.
http://www.flex.com/~jai/satyamevajayate/tejo.html
Makes more sense than 1600s mentioned in wikipedia. A Hindu (Shiva) Temple is also logical; Indians were Hindu before islam was brought to India. Nor is the architecture Islamic, which was my point. But, I still can't find a photo of a Hindu Temple (or remains of one) similar to Taj Mahal's design (at least from the outside), which also predates Taj Mahal.