The mask museum is touted as Sri Lanka's original/oldest by most people. It's located on the Galle Road and is a fairly small joint. A garage type workshop where one can do a very quick walk through seeing the artisans at work is the primary feature. The museum is a very small gallery depicting the culture and details on masks (nothing much to write home about). The staff make a very hesitant request for donations (albeit the large signboard that clearly specifies that the museum has been sponsored by a german agency). They are not pushy though. There is no entry fee (some places in Sri Lanka can hit you with a very high fee is you dont ask upfront).