The Archaeological Museum is in Kastro, housed in the former Jesuit school where novelist Nikos Kazantzakis was briefly a pupil. The contents include Hellenistic and Roman terracotta figurines and some early Cycladic figurines.
The Della Rocca-Barozzi Venetian Museum , a handsome old tower house of the 13th century, is within the Kastro ramparts (by the northwest gate). A visit takes you into the fascinating world of the historic Kastro and its Frankish and Venetian past. There are changing art exhibitions in the vaults. Tours are multilingual.
The museum also runs tours (adult/student around €15 /around €10 ) of the Kastro at 11:00 from Tuesday to Sunday; tours last just over two hours. Evening concerts and other events are staged in the grounds of the museum.
The museum features fragments of a Mycenaean city of the 13th to 11th centuries BC that was abandoned because of the threat of flooding by the sea. It's a haunting place where glass panels underfoot reveal ancient foundations and larger areas of excavated buildings.