Millions of Hindu pilgrims are gathering in India to bathe in sacred waters for the six-week-long Kumbh Mela festival -- from the very old to babies, cave-dwelling monks to science teachers.
The millennia-old Kumbh Mela, a show of religious piety and ritual bathing -- and a logistical challenge of staggering proportions -- is held in the northern city of Prayagraj in Uttar Pradesh state.
