If you don't know, now you know.
It's not often you hear folks complain about the high cost of visiting national parks.
But if it's the price of admission that's been keeping you in front of the television instead of enjoying America's natural splendor, this is your lucky week: it's National Park Week, which means that entry to the nation's 401 National Parks is free until Sunday. That includes everything from the Grand Canyon ($12 per person, $25 per vehicle) to Antietam ($4 per person). There are plenty of National Parks in cities, too. Here's a map where you can look for parks near you.
Of course for $80 you can get an annual pass, which offers free admission to all national parks for a year.
The National Park Service even has a little jingle to get you excited about the opportunity: