For over 180 years, we’ve been collecting stamps, and philatelists have put a high price on the rarest of the rare ... mountains and rivers across the country are a sea of red," according ...

While you might expect some of America's most valuable relics to be items like jewelry or coins, you might be surprised to ...

The "Inverted Jenny," 1918, one of the rarest and most valuable stamps in the world, celebrates the first air mail in the U.S.—by depicting an inadvertently upside-down airplane. Hannah Whitaker ...