The Civic Center in Marin County, California was Frank Lloyd Wright's only government commission. Its ends are nestled in two hills, and it spans the space between. It bridges over three roads within the complex, providing sheltered entrances for all who enter. A few photos showing how it fits into the landscape are posted elsewhere. They will give you an idea of the totality from which these pieces are extracted: https://pbase.com/duckb_ll/image/83067828 and https://pbase.com/duckb_ll/image/57129392