A sea lover's delight, the Maritime Museum is Rotterdam's noted nautical collection. Appropriately perched at the head of the Leuvehaven harbor, it was founded by Prince Hendrik in 1874. Set against the background of modern and historical maritime objects, the seafaring ways of old Rotterdammers make more sense. Star attraction of the ground floor is a large model of the Europoort, which shows how the Rotterdam area has developed over the centuries into the major seaport of today. The upper floors are mainly given over to rotating exhibitions on seafaring themes. Children have half a floor dedicated to them, called "Professor Plons" (Professor Plunge), where museum staff are on hand to help with looking through a real periscope, donning a hard hat and taking to the driving seat of a scaled-down crane, and engaging in many other activities dealing with the themes of water and ships. Outside the museum, a dozen or so old tugs and barges are moored along Leuvehaven, and there's even a former lightship. The wharf is also home to a number of cranes salvaged from ports around the country, and these are particularly attractive when floodlit at night.