Kungsholmen has seen several transformations. The island was first home to Franciscan monks in the 15th century. A period of industrialization started in the 18th century. Military structures were added during the 19th century. Kungsholmen radically changed again in the 1900s when a formal city plan was followed to construct the current housing. These colorful shoreline buildings hug Riddarfjärden bay. The tree-lined Norr Mälarstrand street also acts as a quay for mooring boats.