The Fortezza castle, at the top of a low hill named "Palaiokastro" dominates the town. It was built in 1590 to protect the city from the pirates raids and the Turks.
The name "Palaiokastro which means 'The old Castle' was in use even by the Venetians which demonstrates the existance of an even older castle at this place. - Probably the acropolis of the ancient town of Rithymna.
The interior of Fortezza accommodated the following basic buildings: the storeroom of the artillery, where canons and weapons were kept, the residence of the Councilors, where one of the city's two Venetian councilors lived, the residence of the Rector, which represented a luxurious, magnificent building in the central square of the fortress.
Today parts of those buildings, as well as of some others built later, can be seen. The view from up there is magnificent, especially at night.
The municipal theatre "Erofili" stands also at Fortezza's premises. It is an outdoor theatre that hosts almost all the performances during the Renaissance Festival.

The " Museum of ancient Eleutherna - Homer in Crete" , was created to accommodate the results of the excavations carried out for thirty years in the ancient city of Eleutherna (Eleftherna GR: Ελεύθερνα). It is a modern building approximately 1,800 sq.m. which together with the surrounding area occupies 3 acres and remotely resembles ark that emerges from the earth, gazing Ida (Psiloritis).

Eleftherna (Eleutherna GR: Ελεύθερνα) is located on the foothills of Mount Psiloritis, in the heartland of Crete, 25 km. southeastern of Rethymnon. It was inhabited continuously from the Sub-Neolithic period (4th millennium BC) down to the 12th cent. AD and its rich history is now summarized by five hundred selected artifacts unearthed from houses, shrines, public buildings and tombs.

Margarites (GR: Μαργαρίτες) with 300 inhabitants, is located 27 kilometers from Rethymnon at 300 m above sea level near the amcient town of Eleftherna. Margarites, is a village with Venetian roots, mentioned by sixteenth-century travellers. In the nineteenth century, Margarites was a flourishing town, whose centuries-old ceramic tradition began at least as early as the Ottoman period. Margarites is undoubtedly the most important pottery centre in western Crete.