NPR's Morning Edition reported on the success of the Yellowstone Restoration Project (February 19, 2004). Listen to the program, read about gray wolves, view a map of the wolf population in Yellowstone, or view a photo gallery.

Fort Yellowstone is a former United States Army base created in 1888 to guard the park. It became administrative headquarters of Yellowstone National Park.

Rustic entrance station built in 1935 that is a prime example of form fitting function, in Yellowstone National Park.

A map from 1906 of Idaho showing the capital city Boise, towns, railroads, reservation boundaries, the boundary of Yellowstone National Park, mountain systems, lakes, and rivers.

A map from 1906 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1922 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1922 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, lakes, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1909 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, lakes, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1892 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park, primarily in Wyoming.

A map from 1919 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park, primarily in Wyoming.

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are...

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park,...

A map from 1914 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park,...

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park,...

A map from 1904 of Montana showing the capital of Helena, major cities and towns, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown. "Montana was organized as a Territory in...

A map from 1883 of the 'lower forty-eight’ United States showing state boundaries and state capitals, major cities and towns, mountain systems, lakes, rivers, and coastal features. The map shows Yellowstone National Park, the first in...

A map from 1892 of Wyoming showing the capital, Cheyenne, counties and county seats, principal cities and towns, railroads, mountains, rivers, and Yellowstone National Park.

A map from 1909 of Wyoming showing the capital, Cheyenne, principal cities and towns, Indian reservations, railroads, mountains, lakes, rivers, and Yellowstone National Park.

A map from 1920 of Wyoming showing the capital, Cheyenne, counties and county seats, Indian reservations, principal cities and towns, railroads, mountains, lakes, rivers, and the Yellowstone National Park.

A map from 1920 of Wyoming showing the capital, Cheyenne, counties and county seats, Indian reservations, principal cities and towns, railroads, military reservations, mountains, rivers, and the Yellowstone National Park.

A map from 1914 of Wyoming showing the capital, Cheyenne, counties and county seats, Indian reservations, principal cities and towns, railroads, mountains, rivers, and the Yellowstone National Park. A grid reference in the margin of the...

A map from 1920 of Wyoming showing the capital, Cheyenne, counties and county seats, Indian reservations, principal cities and towns, railroads, military reservations, mountains, rivers, and the Yellowstone National Park. A grid...

A contour map from 1911 showing the topography of the Absaroka Range 10 miles east of Yellowstone National Park.

William Ludlow was an officer in the Corps of Engineers and a major general in the United States Army who served in the Civil War and led a scientific expedition examining the natural wonders of Yellowstone National Park.