Cartography was once the stuff of adventure, madness and speculation; mapmakers were visionaries, scientists and artists. See the world through the eyes of a 17th-century cartographer and astronomer in this feast for the eyes. Cartography was once the stuff of adventure, madness and speculation; mapmakers were visionaries, scientists and artists. See the world through the eyes of a 17th-century cartographer and astronomer in this feast for the eyes.