Richmond Castle, a splendid Edwardian mansion in Kalutara, was built in the early 1900s by philanthropist Mudaliyar Don Arthur de Silva Wijesinghe Siriwardena. This two-storey estate features 99 doors, 34 windows, and exquisite imported materials from around the world. Today, it is preserved by the Public Trustee of Sri Lanka and welcomes visitors to explore its history, architecture, and landscaped gardens.