After decades of abandonment and years of development, The High Line is finally going to open its first section to the public on June 9, 2009. You can enter the elevated park at Gansevoort, 14th, 16th, 18th, and 20th Streets.

The rest of The High Line from 20th Street to 30th Street is still under construction, but I bet there will be a way to get there once the first section gets open.