Central Park re-opens secret sanctuary after 80 years Eighty years after it was shut off to the world, New York has reopened a secret woodland sanctuary a stone's throw from Fifth Avenue just in time for summer. The four-acre (1.6 hectare) Hallett Nature Sanctuary is one of three areas of woodland in Central Park, the huge expanse of nature in the Big Apple visited each year by an astonishing 43 million people. IMAGES AND SOUNDBITES