The Taj Mahal is famous as the world’s most beautiful building – but could this Indian ode to love hide dark secrets? The grieving Mughal Emperor Shah Jahan famously built the Taj Mahal as a tribute to his dead wife – but new investigations are writing a surprising story of power and betrayal.

Is the layout of the mausoleum and its gardens a carefully concealed proclamation of religious beliefs? A team of top architects attempt to solve the riddle of the Taj’s towering dome and could a newly discovered flaw at the heart of Taj finally explain its impossible beauty?