Below are questions that people "actually asked" of Park Rangers around the country, proving once again that there is no known limit to the depths of human stupidity.
(Source: Outside Magazine)

Grand Canyon National Park:

"Was this man-made?"
"Do you light it up at night?"
"I bought tickets for the elevator to the bottom -- where is it? "
"So where are the faces of the presidents?"

Everglades National Park:

"Are the alligators real?"
"Are the baby alligators for sale?"
"Where are all the rides?"
"What time does the two o'clock bus leave?"

Denali National Park (Alaska):

"What time do you feed the bears?"
"How much does Mount McKinley weigh?"

Mesa Verde National Park:

"Did people build this, or did Indians?"
"Why did they build the ruins so close to the road?"
"What did they worship in the kivas -- their own made-up religion?"
"Do you know of any undiscovered ruins?"
"Why did the Indians decide to live in Colorado"?

Carlsbad Caverns National Park:

"How much of the cave is underground?"
"So what's in the unexplored part of the cave?"
"Does it ever rain in here?"