Opened in 1997, this green copper-clad building designed by Renzo Piano—co-creator of the Pompidou Center in Paris—is an international architectural landmark: a ship's hull rising colossally out of the middle of the water, over the Coen Tunnel entrance to Amsterdam North. A rooftop café and summer "beach" terrace (BovenNEMO or "above NEMO") offer a superb panorama of the area. It's worth a visit, just for the view (June-September, 10-7, free). But, in addition, there are five floors of fantastical, hands-on, high-tech fun making this a science wonderland. Attractions range from the giant "bubbles" on the ground floor to experiments in the wonder lab and interactive exhibitions like Teen Facts. Kids love it.