Tim and Pru explore a network totally new to them as they embark on a voyage across the Netherlands. Travelling from the Windmills of the Kinderdijk to the vibrant city of Amsterdam, they explore a country that was partly created by its canals. Half the land was once under water, and it's the combination of windmills and canals that over the centuries prevented the Netherlands from flooding. The voyage takes them to the gardens of Keukenhof, where seven million tulips are on display. There they discover why in the 17th century, one tulip bulb cost the same as a house in Amsterdam. In the city of Haarlem they visit the Teylers Museum, which agrees to open up its archive of rare Rembrandt self-portraits for Tim and Pru to admire. Arriving in Amsterdam, they explore the capital's historic canal district known as the Grachtengordel. Braving Amsterdam's crazy canal traffic they visit one of the most elegant canal-side mansions of Holland's Golden Age.