In honor of National Park Week, more than 100 of the country's national parks will offer free admission Saturday-Sunday, April 21-29.
The free admission covers entrance fees, commercial tour fees and transportation entrance fees. Some parks will also offer discounts on lodging, food and souvenirs.
Participating parks include:
Click here to find parks nationwide.
Travelzoo Tip: Other free admission days this year are June 9, Sept. 29 and Nov. 10-12.