...Pierre-Paul Riquet, the man behind one of the 17th century's greatest works of engineering -- and some say, works of art -- remains in Vauban's shadow, despite his life's accomplishment, which was classified as a UNESCO World Heritage Site in 1996. This 150-mile long waterway was once known as the Canal Royal en Languedoc, for good reason. French revolutionaries may have removed the 'royal' from its title in 1789, yet this is a canal which remains fit for a king. Dappled sunlight streams onto its emerald-green water from between the leaves of the 42,000 plane and oak trees which line...