Visit: www.world-heritage-tour.org
This UNESCO website has 360 degree panoramas of many sites in India as well as other parts of the world. A very good way to preview. If visiting the Taj Mahal be sure to take a half day at least to visit Fatehpur Sikri. It is about a half hour taxi ride from Agra. I have been to Agra six times and would go again. The Red Fort is also worth a visit.