The Shivalinga from the Naguleswaram temple in Srilanka worshipped by Shrirama to nullify the sin of killing a Brahmin after He annihilated Ravan
What is referred to as Lanka or Lankapuri in the Ramayan is the present day Srilanka. In the Tretayug Shri Mahavishnu incarnated as Shrirama and went to Lankapuri where He annihilated the demon, Ravan. Now 70% of the population of Srilanka is Buddhist.