For boundless opportunities to discover nature in all its splendor, national wildlife refuges are unsurpassed. From all parts of the globe, about 40 million visitors flock to nature’s treasure troves each year, especially for the chance to see huge concentrations of wildlife and birds. The National Wildlife Refuge System’s extensive trails, boardwalks, observation decks, hunting and photography blinds, fishing piers and boat launches encourage visitors to discover America’s best wildlife spectacles.