A short walk behind Hallgrímskirkja stands a strange white concrete cube of a building — designed by the sculptor Einar Jónsson himself in the 1920s as his studio, residence, and museum. Jónsson was Iceland's first professional sculptor; his work draws on Norse mythology, theosophy, and a kind of melancholy Symbolism that is unlike anything else in Icelandic art.
The interior is small but packed: figures of Thor wrestling, gods rising from the sea, allegories of birth and death and time. The sculpture garden at the back is free to enter and worth a wander even when the museum is closed.