Considered as one of the most spectacular architectural works, Richmond Castle has the outward appearance of a 19th Century British noble residence. The mansion, which stands majestically at the top of a hill on a 42 acre estate beside the Kalutara-Palatota road, was once the property of a wealthy landowner turned philanthropist, Padikara Mudali Nanayakkara Rajawasala Appuhamilage Don Arthur de Silva Wijesinghe Siriwardena. The castle comprises of a two-storeyed structure with 99 doors and 34 windows, decorated with glass panes of exquisite design along with intricate carvings.
Previously a circuit bungalow for high-ranking officers of the British administrative service, currently it is a popular tourist attraction serving as an educational centre for less privileged children of Kalutara.