Maude Travers checked to make sure no one was looking before she laid hands on the great white oak, the oldest tree in the city of Buffalo, New York. It's a witness tree, after all, having stood young and strong when the Seneca people hunted this land in the eighteenth century. One hundred years later, it was incorporated into Frederick Law Olmsted's vision for the most innovative system of parks and parkways in the United States. Maude was keen to...