"To travel through the cemeteries of New York is to travel through the hidden history of what some consider to be the greatest city in the world. Founded in 1838, Green-Wood became the city's most popular tourist attraction. The cemetery was so popular that urban planners challenged architects to come up with plans for a separate green-space for Manhattan. Hence, both Central Park, founded in 1857, and Brooklyn's Prospect Park, in 1867, were born....