NYC has turned an abandoned elevated railway into a long, skinny elevated park called The High Line that spans over more than a mile in the middle of Manhattan’s West Side.  The elevated railway was in use from 1934 until 1980.  After sitting unused for about 25 years, construction into one of a kind park began in 2006. 

Read more from National Geographic here:  http://ngm.nationalgeographic.com/2011/04/ny-high-line/goldberger-text

And look at photos of it here:  http://ngm.nationalgeographic.com/2011/04/ny-high-line/cook-photography

And here is a link to a video walking through the park:  http://ngm.nationalgeographic.com/video/player#/?titleID=ny-high-line

Here’s the original design video:

And here is a 6 minute documentary:

And here is another short on the history of The High Line, narrated by Ethank Hawke: