Each stamp, stain and dog-eared page evokes memories of past trips and bragging rights among fellow well-traveled friends.

The dealer said that, gram for gram, the stamp is thought to be the most valuable man-made item in ... including the government of France and John du Pont, who was convicted in 1997 of murdering ...

The first stamp was created in Great Britain on May 1, 1840. It wouldn't take long for people to start collecting them. Just one year later, a woman placed an ad in the London Times seeking ...