Devotees from all over the world have pitched their tents at Prayagraj and are performing traditional rituals like this 'Maha Yagya,' or grand fire ceremony.
Chanting mantras in Sanskrit they throw offerings into a fire pit in a day-long ceremony which they believe helps burn bad karma, or deeds.
'Pilot Baba,' a former Indian Air Force fighter pilot, who turned Hindu spiritual leader, holds yoga seminars around the world, attracting hundreds of new devotees each year. One of his most popular prodigies is Japanese national Keiko Aikawa or, as she is known in India, Yogmata. She believes the high popularity of Hindu spiritualism around the world is because it is "natural."
Transgender people have found a place at the festival this year.
Although hijras - the term Indians use to describe eunuchs, androgynous and transgender people - were an integral part of the ancient Hindu society described in the religion's Vedas scriptures, they have been marginalized in modern India, forced out of their family homes as children and often sold into sex trafficking.
Hindu families have continued ancient practices of paying hijras to dance at births and marriages, considering their presence auspicious, while simultaneously denying them access to these same rites.
Among India's best-known transgender activists, a Bollywood reality TV star and a former Asia Pacific representative to the UN, Laxmi Narayan Tripathi is capitalizing on the ruling Hindu nationalist party's emphasis on the nation's Hindu heritage to claim a place for transgender people among its religious elite, stirring both admiration and controversy.
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Her newly formed Kinnar akhara, or monastic order, has set up camp at the week-long Kumbh Mela festival, a series of ritual bathings that rotates among four Indian sites every three years and draws tens of millions of Hindu pilgrims.
Tripathi now spends her time at the Kumbh Mela festival participating in Hindu rituals and setting aside several hours each day to bless devotees and collect cash donations.