Stuttgart has had a long love affair with the automobile, which can trace its roots as far back as 1887 when Gottlieb Daimler and Wilhelm Maybach set up shop here. One of the highlights of any visit to the city must be the wonderful Mercedes-Benz Museum with its exhibits relating to the development of the automobile. The star attractions, though, are the more than 160 vehicles (free audio tours are available). The nearby Untertürkheim diesel engine factory is also open for tours, and the Porsche Museum, with its exquisite collection of more than 300 restored vehicles, is also worth a visit.