Millions of Hindu devotees and mystics have gathered in the northern Indian city of Prayagraj for the Maha Kumbh festival, which is the largest religious congregation on earth.

Authorities in India are racing against time to get the city of Prayagraj ready to host the Hindu festival Kumbh Mela, described as humanity's biggest gathering. About 400 million pilgrims are expected to attend the 45-day spectacle,

Preparations are underway to host millions of Hindu devotees and visitors in the northern Indian city of Prayagraj for the Maha Kumbh Festival (Jan. 12)