Rockwoods Reservation in western St. Louis County harbors a rich diversity of plant and animal life as well as springs, caves, and rock formations. Cool, moist, north facing ravines and lush creek bottoms contrast with the nearby arid, rocky ridge tops, and south slopes. The terrain is reminiscent of the Ozark hills and, indeed, many plants and animals found in hill country are also found here.

Interpretive signs throughout the area point out special features or demonstration areas, such as butterfly gardening, bird feeding, prairie habitat, mining, and quarrying and the history of lime kilns.