NY1 VIDEO: The co-founders of Friends of the High Line, Joshua David and Robert Hammond, took Inside City Hall’s Errol Louis on an exclusive tour of the park.

You can purchase Joshua and Robert's book, "High Line: The Inside Story of New York City's Park in the Sky" by going to the Friends of the High Line website www.thehighline.org.

When you purchase the book through the organization's website one hundred percent of the profits will go to the maintenance of the High Line.