Beneath the Siskiyou forest, near Cave Junction Oregon, are a series of beautiful underground chambers decorated with stone flowers, pillars and draperies. Oregon Caves National Monument became a unit of the National Park System in 1907. I found this to be a rather strange little park. Though the caves were beautiful, I found the forest above to be more so. Another odd bit was that we did not see a park ranger the entire time we were there. The tours were run by a concessioner, and the guides were surly at best. Fortunately, the National Park Service has since taken over the cave tours, so things should be much better now.
The cave was discovered (as so many were) by a hunter chasing a bear. There is a historic lodge near the cave entrance, and lots of very pretty trails through the woods. If you are visiting in the summer months, be sure to get there early, as tickets are limited, and they do go fast.