Here's How You Can See The National Parks For Free

America's National Park System has been described as the country's best idea and, as we all know, the only way to make something that incredible even better is to make it free—and that's just what they did.

Most of the country's 405 national parks are always free, but 133 of them charge entry fees or offer tours that cost money. For a few days this year, those park fees will be waived so that everyone can enjoy the parks, while keeping their budget intact. According to NPS, here are the 2015  free days:

  • January 19
    Martin Luther King Jr. Day
  • February 14-16
    Presidents Day weekend
  • April 18-19
    Opening weekend of National Park Week
  • August 25
    National Park Service Birthday
  • September 26
    National Public Lands Day
  • November 11
    Veterans Day

If you've been meaning to check out some of the country's most amazing natural beauty, like Denali national park in Alaska, Hawaii volcanoes national park or Acadia national park in Maine, these dates might be the perfect opportunity. Check out the full list of participating parks here—and start planning some trips for 2015.