Have an afternoon of learning and discovery at Institute of Mediterranean Studies, a well-known local research facility.
It won't take too long for you to realize why this scientific research center is a hit with visitors to Old Town Rethymnon. Pay the entry fee and then explore it at your own speed. If you're in the mood for more sightseeing, Fortezza Castle, Rimondi Fountain and Rethimno Kart aren't far from Institute of Mediterranean Studies.