The Kumbh Mela
The Kumbh Mela takes places every 4 years, switching between 3 cities. In 2013, the Maha Kumbh Mela took place in Allahabad. 100 million pilgrims came, making it the biggest gathering of humans in history. The giant camps that are home to 20 million people at a time are built especially for the Kumbh Mela.