NYC‘s High Line, a former freight rail line (1934–1980) that was converted to a public park, runs for about a mile and a half (2.3 km) through the Meatpacking District, Chelsea, and Hell’s Kitchen (from Gansevoort Street to West 34th, on the West Side of Manhattan). It’s public and sees millions of visitors a year. The first section was opened in 2009, and the second was opened in 2011.
The 23rd St. Lawn is a popular resting spot (although it’s closed on Mondays and Tuesdays for restoration). There are several kinds of tours that run fairly often, such as guided walking tours, stargazing tours, tree tours, and history tours.
Photo courtesy of David Berkowitz via Flickr.