One of the lesser known museums in Heraklion is the Historical Museum of Crete. This has modern history of the island and most notably the library of Nikos Kazantzakis, author of Zorba the Greek. My only knowledge of this was from clips of the film based on the book, with Anthony Quinn dancing. An excellent multimedia display shows excerpts of films based on Kazantzakis work and relates this to the books and plays. The theme from the film "Zorbas" (Zorba's dance by Mikis Theodorakis), was performed at the wedding I attended at Palaios Panteleimonas.
The museum also has a pleasant cafe courtyard.