Best reached by a lovely 20-minute hike through the fields, along a trail that starts southwest of the monastery, this astonishing Mycenaean-era acropolis was founded 3000 years ago. Its restored cyclopean walls are a little newer, from the 4th century BC – what looks like modern graffiti is in fact ancient dedications. Pass through the forbidding gateway and you can climb atop the massive blocks of volcanic rock for breathtaking views. Good explanatory signs in English are scattered throughout.