Fortezza Castle is a historic fortress located in the heart of Rethymnon. The fortress was built by the Venetians in the late 16th century and served as a defensive structure against invading Ottoman forces. Today, Fortezza Castle is a major tourist attraction and a well-preserved example of Venetian architecture. The fortress is surrounded by high walls and bastions, with an impressive entrance gate and a central courtyard. Visitors can explore the fortress, climbing to the top of the walls and enjoying panoramic views of the city and surrounding landscape. The fortress is also home to several churches, including the Church of St. Nicodemus and the Church of the Holy Virgin.