I've wanted to go to the High Line ever since I saw the plans for it in a special exhibition at the MoMA years ago. Finally, Isa and I made it down to the Meat Packing District to check it out. Basically, the elevated tracks were used for freight trains in the 1930's, but they soon fell out of use, and nature had its way with the structure.
A few decades later, New York Parks came out and tamed the wilderness and put paths, benches, and railings in so that we could enjoy it.
And it's got a sweet view of the Hudson.
So if you're in New York, you should definitely make the trek out to the High Line. It's one of the most unique parks I've ever been to. A perfect combination of two of my favorite things to photograph: nature and architecture.