BMW MotorcyclesBerlinDaily tours of the BMW motorcycle factory, Monday – Friday.
Fendt TractorsMarktoberdorf, GermanyFendt do have a brand museum and they do operate factory tours, although “participation in a factory tour is primarily limited to customers and active farmers”, but there’s always a chance! Fendt have nine manufacturing plants around Europe. The brand museum and tours are at their main production plant at Marktoberdorf in Bavaria, but some of the other plants, like Breganze, appear to offer tours to end users or “enthusiasts” organised through dealers.
Volkswagen Autostadt & Factory TourWolfsburg, GermanyWolfsburg is the headquarters of the VW group which includes Audi, SEAT, Skoda and VW itself.
The Autostadt is an automobile theme park, which opened in June 2000. There are numerous attractions for adults and children including various marque pavilions (Bentley, Lamborghini, Audi, Seat, & Skoda) and lernpark where kids aged 5-11 can drive mini-beetles at 4km/h. Visitors can combine a tour of the VW Wolfsburg factory (8 KmSq, the largest plant under one roof in the world) with a visit to the autostadt. The 2-hours factory tours are available every working day from Tuesday to Friday. Near the Autostadt is the VW Auto Museum, VW’s brand Museum presenting the history of VW. 
PorscheStuttgart, GermanyPorsche have a museum with 80+ vehicles from the early years to the present day.
Swarovski Crystal WorldsInnsbruck, AustriaSwarovski, the costume jewelry & glass collectables manufacturer, have an underground crystal cave which doubles up as an art installation and visitor centre/shop.