The High Line is a must-see for so many reasons and art is high on the list. On any given day, you're likely to see vibrant murals, like Kerry James Marshall's Above the Line, or a selection of films and videos using various techniques like clay animation and hand-drawn animated sketches. One of the most innovative projects of late is Olafur Eliasson's The collectivity project, which is an interactive installation of a city built with white LEGO bricks.
A jaunt through the High Line is free and open year-round, making this an easy addition to a whirlwind weekend getaway to New York. Either show up and be surprised by the new and existing exhibitions or do some research ahead of time on their official website. Right now there is an exhibition called Blocks by Rashid Johnson and unlike regular sculptures, this particular one transforms and interacts with the surrounding vegetation.