According to Wikipedia, "A lighthouse was constructed in Pondicherry in the nineteenth century by the French rulers. A new lighthouse was constructed in 20th century by the government of India."
There are few clear delineations on travel sites between the old and new buildings. The old lighthouse is a landmark with an interesting exterior versus the new lighthouse is bland on the exterior.
The blandness of the new lighthouse obscures the captivating interior staircase design.
Virtually stand atop of the new lighthouse in Google Maps at Puducherry, India.