The McKenzie Pass - Santiam Pass National Scenic Byway loop road is one of the most beautiful drives in Oregon. It winds through some of the most recent volcanic flows in the state past many waterfalls, and is home to the Dee Wright Observatory. This CCC project, built mostly out of lava rock in the 1930s, has breath-taking views of Mt. Washington, Mt. Jefferson, the Three Sisters, and, on clear days, Mt. Hood.