This guide does not list individual places yet.
Sri Dalada Maligawa
It houses a tooth relic of the Lord Buddha, and is consequently considered one of Sri Lanka's most holy shrines. Although you should expect that you will not be able to view the actual tooth itself, the casket within which it is said to be is displayed twice a day. The first is at 5:30AM and the second which could be the best time to view this ornate casket is around 6:30PM. Besides, Sri Dalada Maligawa museum can be found on its second and third floor.
It now houses archeological museum.
World's first International Buddhist Museum.
Under reconstruction since early 2016
Houses an interesting collection of Sri Lankan relics. It is usually quiet and the museum workers are more than happy to provide a free tour.