Government Museum, Chennai is one of the best museums in India. It is located in an old Victoria style building with high ceilings and arches. It is the second oldest museum in India after Kolkatta and also the 10th oldest museum in the world.
It has impressive collections of ancient coins, rare paintings of Asia, Europe and some Raja Ravi Varma paintings. It has also rich collection of bronze idols and stone sculptures of India.
One can get more details of the museum here https://www.govtmuseumchennai.org/museum/