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The Grand Canyon Caverns, located just a few miles east of Peach Springs, Arizona, lie 230 feet (70 m) below ground level. They are among the largest of dry caverns in the United States. Dry caverns are a rarity in that as little as 3% of caverns in the world are dry. Because of this fact, stalagmites and stalactites are very few in numbers. Air comes into the caverns from the Grand Canyon through 60 miles (97 km) of limestone caves. Scientists were curious as to how far the caverns extended and looked for a safe means of finding out. Rather than explore the canyons, which could take years, red smoke flares were ignited by University of Arizona students, and two weeks later red smoke was seen protruding from vents, near Supai, AZ, in the Grand Canyon, thus the name. The caverns are enormous, with measurements showing that the length of 3 football fields could fit snugly within its boundaries.
Just a few photos of the Ohio Caverns in north-central Ohio. I spent a summer day there during my vacation in May 2010.
Lake Shasta Caverns is a system of caves made of limestone positioned near the McCloud arm of Shasta Lake. It is said to be at least 200 million years old and was formed by flowing water that later drained and left the astonishing caverns.
In April 2018, my grandson, Hamlet, and I visited the Olentangy Indian Caverns just north of Columbus, Ohio.
Besides the caverns there is also a playground, a fun miniature golf course and a sluice to mine for minerals.
The sluice.