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Did you know ...

• men from the 1st Oregon Volunteer Infantry Regiment were the first explorers to climb down the 800-foot (240 m) caldera wall to reach the shore of Crater Lake?
• the underwater volcanoes of the Vance Seamounts are pocketed by multiple calderas, many of which have been almost erased by newer flows?
• the eight volcanoes of the President Jackson Seamounts are heavily pocketed by 29 calderas and pit craters?
• in 1865, a party led by Captain Franklin B. Sprague of the 1st Oregon Volunteer Infantry descended an 800-foot (240 m) caldera wall to become the first explorers to reach the shore of Crater Lake?
• eruptions from Mahogany Mountain, a caldera volcano, produced rock formations in Leslie Gulch over 15 million years ago?
• Rim Drive in Oregon, a scenic highway cited by the American Automobile Association as one of the ten most beautiful roads in the U.S., is a 33-mile loop that follows the caldera rim around Crater Lake (pictured)?
• Sinnott Memorial Observation Station is a sheltered viewpoint built into the caldera cliff 900 feet (270 m) above Crater Lake in Oregon?
• a pit crater (example pictured), unlike an impact crater, is formed by the ground sinking over a void such as an emptied magma chamber or caldera?
• thermal vent ecosystems have been discovered in the Aegean Sea, in the caldera of Kolumbo underwater volcano?