Painting marking the grave of an unidentified migrant. Photo by high school student Bygoe Zubiate, courtesy of Borderland CollectiveThe learning in PBL often transcends the teacher’s original purpose. Many times students experience powerful, yet unplanned learning, and projects sometimes radiate into the world in unexpected ways. It’s easy to dismiss such moments as purely coincidental, yet intentional pedagogical designs can increase the likelihood of PBL serendipity. The following two projects provide case studies about how to foster serendipitous moments in PBL.