Puri
If you're in Puri during the Rath Yatra (June–July), witnessing the three giant chariots of Jagannath, Balabhadra, and Subhadra being pulled through the streets by hundreds of thousands of devotees is one of the most extraordinary spectacles on earth — an event that's been held annually for over a thousand years.
Position yourself near the Singhadwara gate of the temple by 8 AM — the chariot procession begins around 9 AM and moves slowly towards Gundicha Temple.