An Everglades ranger lends a hand at Long Pine Key campground.

Today a great many of our nation's historic assets are preserved by the National Park Service.

The Fortress of San Felipe Del Morro, San Juan, Puerto Rico, one of the most massive Spanish fortifications in the western hemisphere.

North Bridge in Minute Man National Park, Concord, Massachusetts, where American Patriots repulsed British Regulars, April 19, 1775.

Mabey Mill, a working grist mill on the Blue Ridge Parkway, is part of a living exhibit area depicting various types of industry operated by mountain people.

In the Virgin Islands National Park a ranger gives an orientation talk to visitors.