Hindu holy men and devotees march and chant prayers during a religious procession on the second day of India's giant Kumbh Mela festival. 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. Organisers expect 400 million people to attend the festival, which began on Monday and will run until February 26. IMAGES