1886 Benz Patent Motorwagen
This was entered in the April edition of Lego's Technic Challenge, which was to build a supercar. Here's what I wrote:
"As you can drive this without having to look at a horse's bottom, this was probably pretty super back in 1886.
Things my remote-controlled model features include: tiller steering, chain-drive and a spinning flywheel at the back. It uses only parts from Technic sets."
Since then, I added a Miniland-scale Karl Benz figure and entered it in the April edition of LUGNuts' challenge - Autos Aus Deutschland!