His son Jacob reworked in 1617 designs of his father for the sixth volume of the Civitates, which was published in Cologne in 1618. Volume 6 contains a homogeneous series of images of cities in Central Europe (in Austria, Bohemia, Moravia, Hungary and Transylvania), which are very consistent in their graphics. The views are in perspective, and only in a few cases, isometric and stand out through the accuracy of the information, the particular attention to the faithful representation of the territory, the landscape, the road conditions and the power of observation and refinement of interpretation.