The world's first postage stamp was issued by Great Britain in 1840. Featuring a bust of Queen Victoria, it has come to be known as the "Penny Black." It also marked the introduction of "uniform penny postage" in a mail system: the rate to carry a letter to ANY destination within the country was now the same, and not based on distance carried.
Ever wanted to know how Irish people wrote before they adopted the Roman Alphabet? This is the 'Ogham Alphabet' and its how the pre-Irish used to write. This book, the "Book of Ballymote", dates to at least 1st Century BC.