If you want to stroll along the High Line in its natural state, you’ll get a final chance at this reservations-only art exhibition. The Rail Yards, the last undeveloped section of the elevated park (between 30th and 34th Sts), is set to open as a landscaped public green space sometime in 2014. But first, Brooklyn artist Carol Bove is taking over; seven abstract spiral sculptures dot the 300-yard stretch of abandoned railroad tracks, which has given way to wild bushes and grasses. Admission is free, but advance reservations (at carolbovecaterpillar.eventbrite.com) are required. Enter at 34th St between Eleventh and Twelfth Aves. Open through May 2014.