The National Museum of Finland will be closed to the public from October 2023 for a period of between two and three years.
In a press release, the popular cultural attraction said that the closure is due to renovation of the museum's historic main building as well as the beginning of construction on an extension at the site on Helsinki's Mannerheimintie.
The extension is due to open to the public in the spring of 2027.
The construction project is the largest in the museum's 100+ year history, and has a target budget of 55 million euros. The extension was designed by JKMM architects, known for previous works including the Amos Rex Art Museum in the centre of the capital, as well as the Dance House Helsinki.
The extension will be mainly underground, with a pavilion rising into the courtyard garden.
The main building of the National Museum of Finland was completed in 1910, opened to the public in 1916, and was designed by the architectural trio Herman Gesellius, Armas Lindgren and Eliel Saarinen.