A dying breed of tree thrives in an American park

We're standing on the Mall of New York City's Central Park, in the middle of fall foliage season. When Frederick Law Olmsted and Calvert Vaux designed this quarter-mile walkway, they were inspired by Europe's public spaces. They envisioned a 'grand promenade' where people of all backgrounds, from the city's monied elite to those of lesser status, could come together and mingle.
© AWL Images/Danita Delimont