New York Times video report on the 2013 Kumbh Mela festival held in Allahabad in India currently.
The event, every 12 years, is billed as the biggest gathering on Earth. More than 100 million people are expected to attend the 55-day festival.
Hindus believe a festival dip will cleanse sins and help bring salvation.
In 2001, more than 40 million people gathered on the main bathing day of the festival, breaking a record for the biggest human gathering.
For festival-goers, one of the most memorable spectacles of the day was when the Naga sadhus, or ascetics, sprinted into the river reciting religious chants, many clad only in marigold garlands.
The naked ash-smeared men arrived in a colourful procession and waded into the chilly waters of Sangam - the point at which the rivers converge.
The Kumbh Mela has its origins in Hindu mythology - many believe that when gods and demons fought over a pitcher of nectar, a few drops fell in the cities of Allahabad, Nasik, Ujjain and Haridwar - the four places where the Kumbh festival has been held for centuries.
View my complete gallery of images from the Kumbh Mela
