1. Yellowstone National Park is home to the world's largest active geyser, the Steamboat Geyser, which can erupt up to 300 feet in the air.
2. The largest underground lake in the US is located in Mammoth Cave National Park, Kentucky.
3. San Francisco's Lombard Street is known as the "crookedest street in the world," with eight hairpin turns.
4. The world's largest hot spring, Grand Prismatic Spring, is located in Yellowstone National Park.
5. The world's largest rose bush is located in Tombstone, Arizona and covers an area of 8,000 square feet.
6. The world's largest ball of twine is located in Cawker City, Kansas and weighs over 19,000 pounds.
7. The world's largest totem pole is located in Sitka, Alaska and stands at 132 feet tall.
8. The world's only corn palace is located in Mitchell, South Dakota and is made entirely of corn and other grains.
9. The world's largest lava tube system is located in Lava Beds National Monument, California and spans over 25 miles.
10. The world's largest tree by volume is General Sherman, located in Sequoia National Park, California.