These were actual questions asked by visitors to staffers and guides at American national parks:

Grand Canyon National Park, Arizona: Didn’t Teddy Roosevelt dig this big ditch, and how long did it take him? And where is Teddy’s face and those of the other presidents, like Robert E. Lee, Ben Franklin and Andrew Carnegie?"

Yosemite National Park, California: “Were the ancient Yosemites tribes that lived here thousands of years ago related to the Semites in the Holy Land?

Yellowstone National Park, Wyoming: “When can we get to meet Yogi Bear?” ... and ... “What kind of fuel do you use to heat the water in the Old Fathful geezer (geyser)?”

Carlsbad Caverns National Park, New Mexico: "What time do they close the cave doors for the night?" ... and ... “What’s the average rainfall in the Caverns?”

Petrified Forest National Park, Arizona: “If there’s a fire in the Petrified Forest, will those stone logs burn?”

Mesa Verde National Park, Colorado: “Did John Wayne or Clint Eastwood discover this park?”

Everglades National Park, Florida: “Are those alligators in the water there real, or like the mechanical ones at Disney World?”

Denali National Park, Alaska: Which president is Mount McKinley named after?” ...and... “Is it OK to feed and pet the grizzly bears from our car window?”