This is the largest gathering ever know to human beings. This is the biggest spriritual gathering that happens after every 12 years.One simple but important thing to note from this video is that maximum people are wering sweaters and mufllers as there is so much cold but naga rushi (saint who follows lord shiva) are roaming nude there. they are not even shivering. This indicates the state of there mind or the spritual level they have reached.
The observance of Kumbh Mela is believed to have started thousands of years ago, in the Vedic period, gods and demons made a temporary agreement to work together churning amrit (the nectar of immortality) from the Ksheera Sagara (primordial ocean of milk), and to share the nectar equally.

