One of the highlights of the Cultural Triangle, if not the whole of Sri Lanka, is the great ruined capital of Polonnaruwa is. In its twelfth-century heyday the city represented a high point of early Sri Lanka civilisation.
Polonnaruwa has extensive and well-preserved structures that offer a fascinating glimpse of the Sri Lanka of the middle ages, including some of the island’s finest monuments. It is compact enough to be looked over fairly completely in a single (but busy) day.