The site will eventually include spectrograms from the following parks:

Acadia National Park, Maine
Badlands National Park, South Dakota
Bryce Canyon National Park, Utah
Devils Postpile National Monument, California
Everglades National Park, Florida
Glacier National Park, Montana
Glen Canyon National Recreation Area, Utah and Arizona
Golden Gate National Recreation Area, California
Great Basin National Park, Nevada
Grand Canyon National Park, Arizona
Great Smoky Mountains National Park, Tennessee
Haleakala National Park, Hawaii
Hawaii Volcanoes National Park, Hawaii
Zion National Park, Utah
Kaloko-Honokohau National Historical Park, Hawaii
Lake Mead National Recreation Area, Arizona and Nevada
Minute Man National Historic Park, Massachusetts
Mojave National Preserve, California
Mount Rushmore National Memorial, South Dakota
Mount Rainier National Park, Washington
Muir Woods National Monument, California
Natural Bridges National Monument, Utah
North Cascades National Park, Washington
Point Reyes National Seashore, California
Pu'ukohol? Heiau National Historic Site, Hawaii
San Antonio Missions National Historical Park, Texas
Saguaro National Park, Arizona
Sequoia National Park, California
Kings Canyon National Park, California
Yellowstone National Park, Wyoming
Yosemite National Park, California