Looking for something to do this month that's both outdoorsy and free? To kick off the National Park Service's second century of operation, you can visit any one of the more than 400 parks on September 30, 2017 for free.

While the majority of the NPS's parks are free year-round, they'll be waiving admission fees to the more than 100 parks that normally require an entrance fee. Which means that you can pay a visit to the Grand Canyon, Death Valley, Yosemite, or Yellowstone National Parks without reaching for your wallet.

The National Park Service, which celebrated its 100th birthday last year, maintains 417 designated NPS areas that span more than 84 million acres across every state, plus Washington, D.C., American Samoa, Guam, Puerto Rico, and the Virgin Islands.

If you can't make it to the great outdoors this month, you can tag along with Hamilton star Jordan Fisher, who took us on a tour of Alexander Hamilton’s New York City home, the Hamilton Grange National Memorial, earlier this year.