This iconic green-copper building, designed by renowned Italian architect Renzo Piano, towers above the entrance to the IJ Tunnel and is almost completely bordered by water. Offering spectacular views from its rooftop square, the building also features interactive water- and wind-powered exhibits. Inside, children of all ages are invited to explore four floors of entertaining activities, such as operating machinery with a pulley, making bubbles, playing with light and shadows, and learning about the adolescent psyche. There truly is something for everyone at this interactive museum.