The New York City High Line park was created atop a 1.45 mile section of elevated, disused railway, hidden from the intense urbanity. Netherlands-based landscape designer Piet Oudolf spearheaded the project. He envisioned an area of sustainable, tranquil nature, made possible by separation from the pollution-infested metropolis. Oudolf based his work upon the plants already growing naturally amid the abandoned train tracks. This was because he realised that native and drought-tolerant plants would incur less maintenance. On June 9, 2009, the first section of this elevated garden opened to the public; the last part opened on September 21, 2014. Beautiful, green serenity hanging above the madness of Manhattan allows for a respite from the city.