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Grand Canyon National Park
The Grand Canyon was carved over roughly six million years by the Colorado River cutting through layered rock, exposing nearly two billion years of Earth's geologic history in its canyon walls — a span of visible rock strata that's made the canyon one of the most significant geological teaching sites anywhere in the world. President Theodore Roosevelt, who visited in 1903 and reportedly called it "the one great sight which every American should see," used his executive authority to declare it a national monument in 1908 over the objections of mining and business interests who wanted to develop the area commercially, a designation Congress later upgraded to full national park status in 1919. The canyon spans roughly 277 miles long, up to 18 miles wide, and over a mile deep at its most dramatic points, a scale so vast that it's genuinely difficult to photograph in a way that conveys its actual size, a common observation among first-time visitors who often describe the canyon as looking smaller in photos than it does from the rim in person. The Grand Canyon's combination of nearly two billion years of exposed geologic history, Theodore Roosevelt's direct personal advocacy for its protection, and its almost incomprehensible physical scale has made it one of the most visited and universally recognized natural landmarks not just in the national park system but in the entire world.
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Great Smoky Mountains National Park
Great Smoky Mountains National Park, established in 1934, is consistently the most visited national park in the entire United States by a wide margin, drawing well over 12 million visitors annually — more than double the visitation of the next most popular park — a status driven substantially by its free admission and its position within a day's drive of a huge share of the eastern US population. The park straddles the border between Tennessee and North Carolina, and its name comes from the natural blue-tinted haze that often settles over the mountains, produced by volatile organic compounds released from the region's dense forest vegetation rather than pollution, a genuinely natural atmospheric phenomenon. The Great Smoky Mountains hold one of the most biodiverse temperate forest ecosystems in the world, home to more tree species than all of Northern Europe combined, along with a synchronous firefly species whose brief, coordinated flashing display each early summer has become its own significant seasonal tourist draw requiring a separate lottery-based viewing permit. Great Smoky Mountains National Park's combination of being the most visited national park in the country, its naturally occurring blue haze, and its exceptional forest biodiversity has made it the essential accessible-wilderness entry point for a huge share of the American population that might never otherwise visit a national park at all.
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