Today is Martin Luther King Day. To celebrate the national holiday, state and national parks are waiving entrance fees for the day. The fee free day includes the Grand Canyon, Sunset Crater, Walnut Canyon and more. Lowell Observatory is also holding its annual Community Day today from 10 a.m. until 10 p.m. There will be solar viewing in the daytime, nighttime telescope viewing and guided tours. Admission is free. Local and state offices are also closed today.