Explore some of the little-known corners of Prospect Park in this tour that uncovers some of the park's hidden treasures. Once prime attractions, these areas  are currently the focus of Prospect Park Alliance restoration efforts to revitalize the Park. The tour includes the Rose Garden and Vale of Cashmere in the park's northeast corner, and well as a guided walk through Brooklyn's last remaining forest, the 150-acre Ravine. Advance registration required; $20