Back in the mid 1990’s when I turned my back on a career as a Landscape Architect, it was partly because of a lack of visionary external design projects in the UK. Happily our attitude towards commercial and municipal landscaping has moved forward, resulting in triumphs such as the restoration of Trentham in Staffordshire, The Queen Elizabeth Olympic Park and exciting proposals for a Garden Bridge in London. Since first stumbling upon the project in the winter of 2010, I have admired the efforts of the Friends of the High Line in transforming an abandoned freight rail line running through Manhattan, New York. Four years later the third and final section of the historic structure at the Rail Yards will open, creating a green link between Gansevoort Street in the Meatpacking District and West 34th Street. If not the longest park in the world at a distance of 1.45 miles, the High Line is surely among the thinnest?