It's difficult to imagine an uncharted world. Today, GPS and satellite maps guide us around cities both familiar and new, while scanning and mapping techniques are gradually drawing the last air of mystery away our planet's remaining unexplored territories. At one time, however, cartography was based on little more than anecdotal evidence and a series of educated guesses. But map-making in the 16th and 17th Centuries was an art nonetheless, even if these examples testify to the fact that just because you're missing important facts, total fabrication may not be the best way forward.