Its a park but a bit higher up
The high line is a park that is on a 1.45-mile stretch of elevated railway track on the west side of Manhattan. This piece of track was built in the 1930’s to reduce fatalities on the street level railways that serviced the industry on the west side.
The last train ran on it in 1980 and it had been left abandoned until it re-opened in 2008 as a park. It is currently being expended and one day will run up to 34th street.
The park contains naturalized plantings that are inspired by the self-seeded landscape that grew on the disused tracks. Old bits of rail and clean concrete lines run from left to right as you walk up the line. The benches are cool too and you will get a different view of the city.
Also there is a very cool hotel that straddles the high line. i think its called the standard hotel.
Here is more info so you can go and explore