National Parks Facts

Yosemite ran a real fire waterfall for nearly a century. On summer nights, workers built a bonfire of red fir bark at the edge of Glacier Point. At 9pm, a caller shouted, "Let the Fire Fall!" Workers then pushed the embers off the cliff in a 3,000-foot cascade of flame. The Park Service banned it in 1968, calling it "as appropriate as horns on a rabbit."

Mammoth Cave in Kentucky is the longest cave system on Earth - over 400 miles of tunnels. In 1842, Dr. John Croghan moved 16 sick patients underground, convinced that cave air would cure their illness. At least five died inside. Nearly all the others died within weeks of leaving. The doctor died of the same disease in 1849.

Death Valley is the hottest, driest place in North America. In February 2024, record rain turned its lowest point into a temporary lake called Lake Manly. It stretched six miles long and three miles wide, but only a foot deep. Death Valley has no outlet to the sea, so a lake this size almost never forms. People still grabbed kayaks and paddled across it.

By 1902, poachers had cut Yellowstone's wild bison down to about two dozen animals. They hid in Pelican Valley, the last free herd left in the country. Today the park counts nearly 5,300 bison. Most summer mornings in Hayden Valley, the herd walks straight down the centerline. Traffic stops in both directions. Rangers still give the same order: stay in the car, be patient, and never honk.

Half Dome is the granite dome in Yosemite that looks impossible to climb without ropes. It isn't. Every spring, a park crew hauls two steel cables up its steepest stretch. Every fall, they take them down. In between, permit holders haul themselves up hand over hand to the summit. Up to 300 people go up on any given day. The cables are up right now. Hikers are climbing them this week.

In 1898, a teenage ranch hand named Jim White rode the New Mexico desert at dusk and saw smoke boiling out of the ground. There was no fire, just bats pouring from a hole. He built a wire ladder and climbed down. That hole is now Carlsbad Caverns' Natural Entrance. Every evening from April through October, a ranger still seats visitors on stone benches there. Several hundred thousand bats spiral out at sunset.

At Zion National Park, the last half-mile to Angels Landing runs along a knife-edge ridge. Drops of about 1,000 feet fall away on both sides. A single metal chain, bolted into the rock for about a century, is the only handhold. So many hikers wanted to try it that Zion had to ration it. Since 2022, a daily lottery decides who gets a permit for that stretch. Winners still grip the same chain to reach the summit.

A Junior Ranger badge cannot be bought. Kids have to earn it. They finish an activity book about the park. Then a ranger swears them in on the spot. Right hand up, they take the oath. About 450,000 kids do this every year. Yosemite alone once swore in 22,600 in a single year. Every one of them still walks out wearing a real badge.

Grand Canyon's Colorado River runs 277 miles through the canyon from Lees Ferry. Inside it sits Crystal Rapid, rated 8 out of 10 on the canyon's own danger scale. A 1966 flash flood dumped rock into the river there. The park's swiftwater rescue team does not avoid that water. In one drill, they flipped a raft on purpose in Crystal Rapid, then raced the current to right it. They still train in it several times a year.

The flag that inspired the national anthem was 30 by 42 feet, with 15 stars and 15 stripes. At Fort McHenry today, visitors still help raise a replica that exact size. Every morning at 10 a.m., weather permitting, rangers hand out the edges and whoever is on the lawn helps hoist it. The original flag hangs at the Smithsonian. The replica still goes up every morning, over the same fort walls.

Elk at the Grand Canyon taught themselves to work the water fountains, lifting the spring-loaded levers with their noses. They guarded the spouts from hikers, and the park rebuilt the fountains elk-proof. The herds crowd the lodges anyway, to dodge cougars, so park biologists brought in a dog. Blue works on a leash and barks them back out.

Jhonatan Gonzalez was hiking the Narrows at Zion National Park with his family - kids as young as 1 - when the calm river suddenly turned waist-deep and raging, choked with logs and debris. He and his brothers planted themselves in the current and formed a human chain. Strangers on the bank grabbed on. Dozens of hikers, including toddlers, passed hand-to-hand to safety. Everyone made it out.

A firestorm roared into the Old Faithful area of Yellowstone in 1988. Crews climbed onto the roof of the giant log hotel beside the geyser to save it. The fire threw embers the size of fists, and cabins nearby burned. Roof sprinklers added a year earlier kept the shingles wet, and crews beat out the sparks that caught. The Old Faithful Inn they saved still stands.

Mount Rushmore has a secret: a 70-foot granite tunnel cut directly behind the faces. Sculptor Gutzon Borglum began drilling it in 1938 to house America's founding documents for future civilizations. Congress shut the project down in 1939 and Borglum died in 1941. In 1998, his family lowered 16 porcelain panels into a titanium vault and sealed it under a 1,200-pound granite capstone. Nobody can go inside.