Mercury's surface in "enhanced color," a color scheme created to emphasize color differences. This is not what Mercury would look like to the human eye, but by applying mathematical analysis to images, color differences can be accentuated beyond those visible to a person.
Mount Rushmore National Memorial under construction.
The workers had to endure conditions that varied from blazing hot to bitterly cold and windy. Each day they climbed 700 stairs to the top of the mountain to punch-in on the time clock. Then 3/8 inch thick steel cables lowered them over the front of the 500-foot face of the mountain in a "bosun chair." Despite the dangers, no one was killed during the project.
Otters in Glacier Bay National Park and Preserve, Alaska.
The sea otter population of Glacier Bay has increased dramatically in the past 20 years. Ecologists consider sea otters a keystone species here. Otters consume vast quantities of clams, urchins, crabs, and other invertebrates and their presence creates ripples through the ecosystem. NPS photo.
Every day someone like you becomes a wildland wildfire fighter, a teacher, a trail-builder, a museum curator, or a park ranger. Discover your opportunities in national parks. Come to play. Come to learn. Come to serve. Develop your environmental leadership skills. Find a job. Be the next generation to preserve and protect these great places.
With more than 80% of Americans living in urban areas, urban parks are more important than ever. The father of American landscape architecture, Frederick Law Olmsted, said of urban parks:
It is one great purpose of the Park to supply to the hundreds of thousands of tired workers, who have no opportunity to spend their summers in the country, a specimen of God's handiwork that shall be to them, inexpensively, what a month or two in the White Mountains or the Adirondacks is, at great cost, to those in easier circumstances.
Our national parks are America’s crown jewels, inspiring awe and wonder. Iconic locations like Yosemite and Yellowstone attract visitors from all over the world, but our public lands are so much more than just the big 59 national parks. They’re also scenic rivers, national marine monuments, national battlefields and wildernesses.
Here at Interior, we work every day to protect our nation’s special places so current and future generations can experience our natural and cultural treasures for years to come. With more than 400 national parks, 560 national wildlife refuges and nearly 250 million acres of other public lands managed by Interior, there’s at least one public land near you.
What’s the difference between a national park, national forest and national monument? What about national wildlife refuges, national historic sites or national conservation areas? We’re breaking down America’s public lands for you:
National parks tend to be large swaths of land that protect a variety of resources, including natural and historic features. National parks can only be created by Congress -- our first national park was Yellowstone -- and are managed by the National Park Service. National parks strive to keep landscapes unimpaired for future generations while offering recreation opportunities.
There are also national preserves -- like Florida’s Big Cypress or Lake Clark National Park & Preserve in Alaska. Activities like hunting, fishing or oil and gas extraction may be permitted at national preserves if they don’t jeopardize the park’s natural resources.
National parks may protect some of the best-known natural landmarks, but national forests have just as remarkable landscapes. The U.S. Forest Service, which is part of the Department of Agriculture, manages 154 national forests under a multiple use concept -- meaning they provide Americans with a number of services, including lumber, grazing, minerals and recreation.
If national parks are America’s best idea, then national wildlife refuges are America’s best kept secret. The U.S. Fish & Wildlife Service manages wildlife refuges to conserve America’s fish, wildlife and plants.
Created in 1903 when President Theodore Roosevelt established Pelican Island National Wildlife Refuge, the Refuge System has grown to more than 560 sites. With at least one wildlife refuge in every state and U.S. territory (and one within an hour’s drive of most major cities), they offer a chance for urbanites and so many others to connect to nature.
While national wildlife refuges work to safeguard wildlife populations and their habitats, more than 500 of them provide a wealth of recreation opportunities, including hiking trails, canoeing and kayaking, auto tours, wildlife viewing, hunting, fishing and more! These natural treasure troves see more than 47 million visits from the public each year.
National Conservation Areas
National conservation areas are public lands managed by the Bureau of Land Management that are set aside for the benefit and enjoyment of present and future generations. Similar to national parks, national conservation areas are designated by Congress and feature scientific, cultural, historical and recreational features. They’re places like California's Lost Coast, King Range National Conservation Area, and Utah's Red Cliffs National Conservation Area.
National conservation areas are just one part of the Bureau of Land Management's National Conservation Lands, a system of public lands that contain some of the nation’s most spectacular landscapes. They include 873 federally recognized areas, encompassing approximately 32 million acres, primarily across 12 western states. In addition to national conservation areas, national conservation lands include certain national monuments, wildernesses, wilderness study areas, wild and scenic rivers, and national scenic and historic trails.
National monuments protect a specific natural, cultural or historic feature. These could be places like Devils Tower National Monument in Wyoming, Utah’s Grand Staircase-Escalante National Monument or Chicago’s Pullman National Monument. Some special places -- like Grand Canyon, Badlands and Zion -- were first protected as national monuments before later becoming national parks.
Since 1906, 120 national monuments have been created, and they can be managed by any of seven different agencies -- either individually or jointly.
Wilderness areas are places untamed by humans. The Wilderness Act of 1964 allows Congress to designate wilderness areas to ensure that America’s pristine wild lands will not disappear. Wilderness areas can be part of national parks, national wildlife refuges, national forests or public lands managed by the Bureau of Land Management. There are more than 680 wilderness areas -- protecting over 106 million acres in 44 states -- with the most recent one designated being Boulder White Clouds in Idaho.
The Bureau of Land Management also has 517 wilderness study areas -- lands unspoiled by roads or other development that provide outstanding opportunities for solitude. Often these places have special ecological, geological or scenic values, like Handies Peak in Colorado or Slinkard in California. Some wilderness study areas have been designated as wilderness areas or national monuments, while others have been opened to non-wilderness uses.
National Historic Sites
Although the National Park Service is best known for protecting some of our country's most inspiring landscapes, it is also America's storyteller. Over half the national park locations preserve places and commemorate people, events and activities that are key to our nation’s history. National historic sites (like Lincoln Home or Tuskegee Airmen) contain a single historical feature, but national historical parks like Independence National Historical Park -- where the Continental Congress voted for Independence and then where, years later, the Constitution was written -- discuss multiple stories from different times. No matter the name, these places tell iconic American stories that define who we are and what we stand for.
National memorials are sites that commemorate a historical person or tragic event. Many national memorials are located in or near the District of Columbia (think the Lincoln Memorial, Washington Monument and Thomas Jefferson Memorial), but several others are scattered across the country. One of the most recognizable: Jefferson National Expansion Memorial in Missouri, which is home to the Gateway Arch (commonly called the St. Louis Arch).
There are a number of titles used for battlefields -- national military park, national battlefield park, national battlefield site and national battlefield -- but they all conserve our nation's military history. Protecting places like Shiloh National Military Park or Cowpens National Battlefield ensures that Americans can learn from our past.
National Recreation Areas
National recreation areas are lands near large reservoirs that offer visitors a chance to experience water-based outdoor activities -- from swimming and kayaking to fishing and boating. These recreation areas also often include important natural and cultural features. The U.S. has a total of 12 national recreation areas, which are managed either by the National Park Service or the Forest Service, and five of these are near urban areas -- providing great opportunities for Americans to connect to nature near them.
Wild and Scenic Rivers
Wild and scenic rivers preserve rivers and the land surrounding them in their natural state -- providing Americans with great outdoor recreation. Key to wild and scenic rivers is that they are free-flowing streams that haven't been dammed or altered in any way. While the Wild and Scenic Rivers Act of 1968 offers different levels of classification depending on the state of the river, in total it has protected more than 200 rivers in 35 states and Puerto Rico.
National Seashores and National Lakeshores
National seashores and national lakeshores preserve shorelines and some surrounding islands. Plus, they are amazing places for water recreation. While national lakeshores can be on any natural freshwater lake, the four existing national lakeshores are all on the Great Lakes. The 10 national seashores are on America's three coasts: Atlantic, Gulf and Pacific.
National trails fall into one of three groups: scenic, historic and recreation. Congress designates national scenic trails (think the famous Appalachian National Scenic Trail, which stretches from Georgia to Maine) and national historic trails (like the Pony Express National Historic Trail, a historic route that spans eight states and symbolizes the spirit of the American West). When it comes to national recreation trails (including national water trails), the Secretary of the Interior or Agriculture can designate these in response to an application from the managing agency or organization.