On the eastern side of Bend, Oregon, US Route 20 is called Greenwood Avenue. It runs at the southern side of Pilot Butte, which is an extinct volcanic cinder cone. According to Wikipedia, Bend is one of the very few cities in the United States with volcanoes located within their boundaries.
There are three trails that cover the state park. All lead to the summit, which provides a fantastic view of the surrounding area, including the city of Bend, and many prominent Cascade Mountain peaks. It sounds like another one of those scenic wonders that the longest road in the United States can bring!
View from the summit
Wikipedia: Pilot Butte
Oregon State Parks: Pilot Butte
US Geological Survey Information on Pilot Butte
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