Yellowstone National Park's most famous attraction is called "Old Faithful." Now, Michelin says its tires make their own claim to dependability inside the oldest national park in the US. Indeed, the tiremaker has donated more than 1,400 tires to the National Park Service since 2008, enough so that the NPS has saved around $300,000 in annual expenses for its 800-vehicle fleet.

We love cars because they're fast and exciting. The postal service, not so much. But at least the mail is reliable, which is a lot more than you could say for most classic British cars, like the ones which the Royal Mail in Great Britain is celebrating with this special philatelic collection.