Graceful as a Roman aqueduct and framed by a blaze of autumn foliage, the Walnut Lane Bridge arches over the glassy Wissahickon Creek in this early hand-colored card — when it was completed in 1908 it held the title of the largest concrete bridge in the world, its main span of 233 feet cleared at a dizzying 70 feet above the water using more than 40,000 tons of cement. The card was sent in July 1923 from Philadelphia to Anna in Louisville, Kentucky, with a delightfully mundane but historically charming message: the writer has just bought Anna a lovely red bathing suit from Wanamaker's — the legendary Philadelphia department store — presumably as a gift, and apparently couldn't wait to tell her by postcard rather than post. A 1¢ green Washington stamp franks the card at the domestic rate.