If you ride the NYC subway system, you've probably noticed some of the incredible sculptures, murals and art installations created by Roy Lichenstein, Sol Lewitt and other dope artists from over the years. The MTA has recently collaborated with Meridian to design, Arts for Transit, a new app that allows users to track hundreds of works installed throughout the city's underground. The free app is available here, and navigates your search by subway line or by artist. Hit the thumbs to check out a collection of screen grabs and more. [DesignTaxi]