Millions of devotees are expected to attend the Kumbh Mela - a 45-day festival beginning in January.

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Naga Sadhus, or naked Hindu holy men, take a selfie before participating in a procession towards the Sangam, the confluence of rivers Ganges and Yamuna, during the first 'royal entry' for the Kumbh Mela in Allahabad, India.  (AP/Rajesh Kumar Singh).

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Hindu devotees pay their respects as they watch Naga Sadhus, or Hindu holy men, participate in a procession towards the Sangam. (AP Photo/Rajesh Kumar Singh)

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Members of an Indian brass band rest after accompanying Naga Sadhus

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