Way down in southwest Oregon, this relatively small park is easy to miss, along a winding road in the mountains and a long way from anywhere—but it’s worth seeking out. Sometimes referred to as the “marble halls of Oregon,” the park’s dramatic marble caves feature a flowing river, ancient wildlife bones, petrified rock gardens, and caverns to explore. The park also features a variety of plants and animals that live only in the region and a charming, rustic lodge with a double fireplace and a stream running through its dining room. Visitors can take a standard cave tour or strap on a helmet and get muddy on the Off-Trail Cave Tour where rangers explain caving techniques, etiquette, and conservation.

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