Almost all known Ciurlionis’ artworks, manuscripts and other works are stored and exhibited at the National M. K. Ciurlionis Art Museum in Kaunas. While in Druskininkai, the former Ciurlionis family house hosts M.K. Ciurlionis Memorial Museum, where you can see the artist's life.
http://www.lithuania.travel/en-gb/attractions/mkciurlionis-art-museum/17120