Millions stroll in New York's 'park in the sky'
7 October 2011 Last updated at 07:00 BST
One of the runaway hits of this past summer in New York has not been on Broadway - instead it has been at a most unusual park which is attracting millions of visitors from all around the world.
The disused elevated railway track that runs through downtown Manhattan now offers commuters and tourists alike a peaceful escape from the chaos on the busy city streets below.
The inside story of New York City's so-called "park in the sky'' is about to be told in a book called High Line.
Michael Maher took a stroll through the park to find out more.