Wildlife-watching, photography, biking, and painting are also rewarding ways to experience Valles Caldera National Preserve during the fall season. We look forward to seeing you at Valles Caldera National Preserve! NOTE: Leashed and well-behaved pets are welcome at Valles Caldera Fall Fiesta. www.nps.gov/vallValles Caldera National Preserve | About 1.2 million years ago, a spectacular volcanic eruption created the 14-mile-wide circular depression now known as Valles Caldera. National Park Service | More than 20,000 National Park Service employees care for America’s 430+ national parks and work with communities across the nation to help preserve local history and create close-to-home recreational opportunities.