Museum Sundays is the initiative of Tallinn City with the aim to bring attention to the daily activities in museums and the rich cultural life of the city, and to improve the accessibility of it to both Tallinners and its visitors.
On the first Sunday of every month there is a free entrance to the following museums: Tallinn City Life Museum, Museum of Photography, Children's Museum Miiamilla, Kalamaja Museum, Museum of Mati Unt, Kiek in de Kök Fortifications Museum with bastion passages, Anton Hansen Tammsaare Museum, Tallinn Russian Museum, etc..
In order to visit museums free of charge on Museum Sunday you need to pre-register.
More information can be found on website.