Well, we didn't think of this.
Not only are national parks closed at home, but tourists abroad will have a hard time visiting any of the 24 U.S.-run military cemeteries that are sprinkled throughout Europe. The cemeteries--among them, the Normandy American Cemetery--are run by the American Battle Monuments Commission and are closed during the shutdown.
If you're a tourist looking to explore America's beloved parks during the shutdown, here's our guide to nearby towns that are worth a visit. Or if you fancy yourself an outdoorsman, here are some state parks that are worth exploring any time--especially now.