They probably won't be so secret anymore after NY1 gets finished with this week's reports , which track down little known (to some) treasures in our fair borough. Monday's offering: the man-made waterfalls of Prospect Park. Turns out the water flowing through them is from the city water system. Does that mean they're good enough to drink? Also included: the Brooklyn Museum. Brooklyn's Hidden Treasures [NY1] Obligatory Waterfall Shot. Photo by dlichaw . ...