Rahmi M. Koç Müzesi (Taksiyarhis Kilisesi)

Housed in Ayvalık's oldest church, this Rahmi M. Koç Museum outpost on Cunda Island is a beautifully restored Greek Orthodox landmark that now doubles as a fascinating collection of historical artifacts and everyday objects from a bygone era. The space itself is the exhibit — the original church architecture has been carefully preserved, giving the displays a dramatic, layered context you won't find in a typical museum. It's closed Mondays, and hours shift seasonally, so check ahead before making the trip.