With their bright and open spaces, in low buildings that bland with the landscape, Frank Lloyd Wright's prairie house designs altered the course of 20th Century architecture--and established a true American style. Many of these beautiful structures, found in Oak Park and River Forest, have now become registered National Historic Landmarks. They include small houses and mansions, churches and government buildings, gas stations and bridges. And Wright thought not only of the building itself, but of the interior design: he, himself, often chose or created the furniture, glass, fabrics, and other accessories that pulled everything together. First among these masterpieces was the Ward Willits House (and gardener's cottage), built in Highland Park, Illinois in 1902. Another piece de resistance, recognized as the epitome of the form: Chicago's exquisite Robie House (1909). Also included are the Johnson "Wingspread," Petit Memorial Chapel, and other major homes built from 1901-1937--so you can see how Wright's work evolved through time.