The Finnish Eduskunta, on the long axis of Mannerheimintie. Designed by Johan Sigfrid Sirén and finished in 1931, the building is the major monument of Finnish interwar classicism — fourteen-metre red-granite columns across the front, a sober, almost severe interior. Guided tours run on Saturdays and on selected weekday afternoons (book ahead in summer); the rest of the time you admire it from outside.
Combine with neighbouring Oodi library and the Kiasma museum — three generations of Finnish public architecture lined up on a single block.