Dutch architecture practice Kaan Architecten has concealed a minimalist wing within the existing 19th-century structure of the Royal Museum of Fine Arts in Antwerp. Invisible from the outside, the extension was added as part of an ongoing, €100 million overhaul of the museum that began ten years ago and includes the restoration of its existing galleries and offices. Top image: pivoting walls allows outsized paintings to be transported through the Royal Museum of Fine Arts Antwerp. Above: Kaan Architecten has added a modern extension to the museum Also known as KMSKA, the Royal Museum of Fine Arts Antwerp is one of the last and greatest examples of neoclassical architecture in Antwerp. Completed by architects Jacob Winders and Frans van Dyck in 1894, it now houses an extensive collection covering seven centuries of art.