Floridians and out-of-state visitors can enter the state’s national parks for free on Tuesday, Oct. 27, in honor of President Theodore Roosevelt’s birthday.

Roosevelt, the nation’s 26th president, was a Republican and a committed conservationist. According to Spectrum News, he doubled the number of national parks during his presidency.

Florida has three national parks and eight other federally designated sites. One of them is the De Soto National Memorial in Bradenton, the Tampa Bay area’s entry on the list.