See this little book?
It's a Passport to the National Parks of the United States. You get to stamp the Passport book every time you go to a national park. At Yellowstone each Visitor's Center has their own stamp so we've got quite a few Yellowstone stamps...
(not our book... an image found on Google to show the effect...)
So basically the Passport book has started to rule our lives after this trip.
We were heading to Mount Rushmore (Ali & Rusty came along for the ride!) but found out the Battle of Little Big Horn was right on the way and we could get a stamp in our passport so... we had to stop, right?
Custer's last stand.
Maybe I should have done my hair? :)