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.
Speech: OIA-DOI Museum Brown Bag -- World Heritage: A Made-in-America Achievement
Jonathan B. Tourtellot, Geotourism Editor, National Geographic Traveler; Founding Director, National Geographic Center for Sustainable Destinations; Principal, Focus on Places LLC
Rachel Carson Room, Stewart Lee Udall Department of Interior Building
In 1972, the United States proposed the World Heritage Convention to the international community as the global expression of the national park idea. The U.S. was the first nation to ratify the Convention. Twenty-one natural or cultural heritage sites in the U.S. are recognized for their outstanding universal value in the Convention's World Heritage List.
In his September 12, 2012 presentation, Jonathan B. Tourtellot explained what the World Heritage Program is, how sites are selected for the List, and why World Heritage listings benefit both the U.S. and its international partners. By promoting “geotourism,” a term Tourtellot has coined to describe sustainable visitation that supports and improves natural and cultural resources, he believes the World Heritage Program can help preserve significant areas throughout the world. In his talk, Tourtellot celebrated the role the United States played in creating this important program, and called for continuing U.S. leadership.