Clear Lake in Oregon - absolutely gorgeous. Plan to take in the 5 mile hike around the lake. An underground spring at the north end of the lake is where the McKenzie river begins. The lake color is amazing!
The Lava River Cave near Bend, Oregon, is part of the Newberry National Volcanic Monument, which is managed by the United States Forest Service. Description from imgarcade.com. I searched for this on bing.com/images