✨ Exploring Oregon Caves National Monument ✨ Hidden deep in the Siskiyou Mountains of Josephine County, these marble caves were formed over millions of years as rainwater slowly dissolved the ancient rock. 🕳️⛰️ Inside the “Marble Halls of Oregon,” you’ll find narrow passageways, shimmering calcite formations, and one of the few marble cave systems in the entire country. Tours take you 220 feet underground — temps stay around 44–45°F year-round, so bring a jacket! A must-see for geology lovers,