Odisha (or Kalinga as it was then known as) is where war-mongering Emperor Ashoka of Magadh had a change of heart. Renouncing war and violence, he not only converted to Buddhism but ensured this religion spread far and wide. Dhauli, near the state capital Bhubaneswar, marks the spot where the emperor went through the transformation after seeing the river Daya turn red with the blood of slain soldiers.