In 2014, Bohuslän Museum conducted a ground penetrating radar survey of the old cemetery at Marstrand church. The results show that a large foundation wall (34×12 m) is hidden in the southern part of the area. A project group at Bohuslän Museum now wants to try to confirm what kind of building remains it is. One hopeful hypothesis is that the remains are the medieval Franciscan monastery that operated on Marstrand from the 13th century onwards. However, the monastery building has not been found so far. The archaeological effort is planned for a few days of exploratory investigation and documentation, but also includes public tours for school children and the public. The project is a collaboration with the Marstrand Hembygdsförening.