The Federal Government may start requiring passports for domestic airfares, and to visit Federal areas, like National Parks. Federal ID plan raises privacy concerns – CNN.com At a time when American travellers to Europe can’t get a passport stamped when traveling inside the European Union. I’m sure Park Rangers checking ID to enter Yosemite and Yellowstone will keep terrorists out of the country. Afterall, Yosemite is only an 8 hour drive from the Mexican border, and it’d be a great place to hide if you can get through the border, the inspection points and the big cities.