The 2025 Maha Kumbh Mela in Prayagraj, a rare event held every 144 years, became the largest gathering ever recorded in human history, attracting over 600 million pilgrims over 45 days. Devotees traveled from across India, sometimes over 2,500 km, to bathe at the sacred confluence of the Ganges and Yamuna, believing it would cleanse their sins and those of their ancestors. A vast temporary city with extensive infrastructure and security was built, while rituals, processions, and blessings by sadhus marked this extraordinary spiritual event.