This PBS site has interactive labs that demonstrate forces, materials, loads and shapes. You can apply this information to building bridges, domes, skyscrapers, dams, and tunnels in simulation. Very nice hands-on activities.
U.S. Department of Labor site. "OSHA's mission is to ensure safe and healthful workplaces in America." Some OSHA programs target areas such as construction and manufacturing and build partnerships with industries to focus on specific hazards.
A compilation of the National Society of Professional Engineers, this site promotes the achievements of engineers in their public works and inventions. You can browse the site by state and make suggestions for additions.