Could the Taj Mahal, one of the World's Seven Wonders, be in imminent danger? It is one of the grandest works of architecture on the planet. But these days, it has plenty of critics. They insist that this monument to undying love is at risk of collapsing into the river that runs beside it. The conservators who know it best dispute the claims. We follow the controversy as two scientific groups examine the Taj's stability. The 360-year-old monument is under serious pressure from the effects of climate change, pollution and mass tourism. After the Mumbai attacks, security is also a serious concern. But could the Taj collapse?