3Mammoth Cave National Park, United States of America
Located near Brownsville, Kentucky, the popular Mammoth Cave National Park was founded in 1941. It includes almost 53,000 acres and spans three different counties. It is named for Mammoth Cave which features the largest network of underground galleries and natural caves on the planet.
With cave names such as “Frozen Niagara” or “Grande Avenue”, it should be obvious how truly spectacular these well-known caves really are. These various formations were created roughly 10 million years ago. In other words, they were here approximately 9.5 million years before the first human ever walked the earth.
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