I try to do at least two field trips per quarter, we visit the local machine shops so students can get an idea of what the demands of the industry are. Boeing is by far the hardest company to get into so I started showing a virtual tour of the 747 plant in everett.
National Geographics has a series called Mega Factories:
Besides the Boeing 747 plant, my favorite tours are:
The Smithsonian tour posted on the cool wiki’s page was easy to navigate and had a great sense of realism. it reminded me of the move Night at the Museum.