For 17 days in 2012, admission to more than 100 of the country's national parks will be free, the National Parks Service has announced.
Some of the most popular ones on the list include Grand Canyon
, and Acadia
. The free days are: Jan. 14-16 (Martin Luther King Jr. weekend); April 21-29 (National Park Week); June 9 (Get Outdoors Day); Sept. 29 (National Public Lands Day) and Nov. 10-12 (Veterans Day weekend).
This marks the fourth year admission to a selection of parks is being waived. Although most don't have an entrance fee, some charge up to $25 per vehicle for a week.
Upcoming Veterans Day Weekend, from Nov. 11-13, are the last of the free admission days this year.
For a list of parks participating in free days, check the National Park Service
Planning to visit one of the national parks? Get the best information for your trip with our National Parks Travel Guide
Photo credit: Bryce Canyon National Park, macorl / Fodors.com member