11/04/2010 03:31 pm ET | Updated May 25, 2011

15 National Parks You've Never Heard Of (PHOTOS)

Now that we know you can go to America's national parks for free on November 11th (Veterans Day), we investigated further and found there are quite a few parks that we weren't as familiar with as, say, the Grand Canyon or Yellowstone.

There are, of course, hundreds of national parks, monuments and trails in America, so we can't include them all here. But here are 16 that might surprise you.