 The return trip – which didn't go through Heidelberg – was along a different, slightly shorter route, as shown on the maps of the Bertha Benz Memorial Route.Benz's Model 3 made its wide-scale debut to the world in the 1889 World's Fair in Paris; about twenty-five Motorwagens were built between 1886 and 1893.The great demand for static internal combustion engines forced Karl Benz to enlarge the factory in Mannheim, and in 1886 a new building located on Waldhofstrasse (operating until 1908) was added.