The Transatlantic Outreach Program offers STEM educators fosters STEM education in an international context through STEM Study Tours to Germany, virtual exchanges, and access to free resources. TOP recently added new STEM materials to their website.  Each lesson begins in Germany and ends in the student's local community with a STEM challenge.

https://www.goethe.de/ins/us/en/spr/unt/efd/top/sus.html