Sample Clues
Great Fountain Geyser
Yellowstone
It's the largest remaining subtropical wilderness in the continental U.S.
the Everglades
You'll see plenty of stalactites & stalagmites at this site, a national park in Kentucky
Mammoth Cave
Bright Angel Trail, East Rim Drive
the Grand Canyon
The 1 million gallons of water that bubbles up each day in this Arkansas park is a warm 140 degrees
Hot Springs