New York City

In the city that never sleeps, an estuary revival is underway. At the edge of one of the busiest harbors in the world, home to nearly 9 million people, there’s an effort to restore 1 billion oysters, filtering the water and building habitat for fish, crabs, and the newly spotted seahorse — a far cry from what most New Yorkers imagine of their home. Whales and dolphins now surface in the harbor, proof that even here, nature is all around us.