Greece’s castles tell a story that extends far beyond their stone walls. Perched above medieval harbours, crowning rocky islands and overlooking sweeping coastlines, these fortresses reveal centuries of Byzantine, Frankish, Venetian and Ottoman rule. For travellers seeking history, architecture and extraordinary views, they offer a compelling reason to explore beyond Greece’s best-known archaeological sites.
From the fortified rock of Monemvasia to the Venetian strongholds of the Peloponnese, these ten castles combine remarkable heritage with some of the country’s most memorable landscapes.
1. Palace of the Grand Master, Rhodes
At the heart of Rhodes’ medieval Old Town, the Palace of the Grand Master stands as a reminder of the Knights of Saint John, who fortified the island between the 14th and 16th centuries. Its imposing towers, monumental gates and spacious courtyards make it one of Greece’s most impressive medieval landmarks. Explore the nearby Street of the Knights and city walls before discovering the Old Town’s atmospheric lanes.
2. Monemvasia Castle, Laconia
Connected to the Peloponnese by a narrow causeway, Monemvasia is a medieval settlement built into a dramatic rock rising above the sea. Stone houses, arched passageways and Byzantine churches create an extraordinary atmosphere, while the upper town rewards adventurous visitors with sweeping views of the Myrtoan Sea. Stay overnight to experience its quieter streets after the day-trippers have departed.
3. Palamidi Fortress, Nafplio
Overlooking one of Greece’s most elegant historic towns, Palamidi Fortress was built by the Venetians in the early 18th century. Its extensive bastions command panoramic views across the Argolic Gulf, Nafplio’s red rooftops and the small sea fortress of Bourtzi. Visitors can climb the famous staircase from town or drive to the entrance, making it an essential stop on a Peloponnese road trip.
4. Bourtzi Castle, Nafplio
Rising from a small island in Nafplio’s harbour, Bourtzi Castle dates to the Venetian period and once helped defend the port against maritime attacks. Its distinctive silhouette is one of the town’s defining sights. Although access arrangements can vary, the fortress is easily admired from the waterfront promenade, particularly in the evening light.
5. Methoni Castle, Messenia
At the southwestern tip of the Peloponnese, Methoni Castle stretches dramatically into the sea. Built and expanded under Venetian rule, this extensive fortification features imposing gates, stone walls and a moat crossed by a long bridge. Its distinctive octagonal sea tower, known as the Bourtzi of Methoni, is a highlight. Combine the visit with neighbouring Pylos and the beaches of Messenia.
6. Koroni Castle, Messenia
Unlike many abandoned fortresses, Koroni Castle remains part of a living neighbourhood. Within its historic walls, narrow lanes wind past homes, gardens and the Monastery of Timiou Prodromou. The atmosphere is intimate rather than monumental, with beautiful views across the Messinian Gulf. Pair a leisurely exploration with a walk along the harbour or a swim at the nearby beach.
7. Chlemoutsi Castle, Ilia
Built by Frankish rulers in the early 13th century, Chlemoutsi Castle occupies a strategic hilltop overlooking the western Peloponnese. Also known as Clermont, it is one of Greece’s finest examples of Crusader-era military architecture. Its relatively remote setting makes it particularly appealing to travellers seeking quieter historical sites. Ancient Olympia and the coastal area around Kyllini can easily be incorporated into the wider itinerary.
8. Old Fortress of Corfu
Standing on a rocky promontory beside Corfu Town, the Old Fortress of Corfu reflects the island’s strategic importance under Venetian rule. Surrounded by the sea and separated from the town by a moat, it offers magnificent views across the Ionian Sea and the island’s distinctive red-roofed skyline. Combine the visit with Corfu’s UNESCO-listed Old Town, historic churches and waterfront cafés.
9. Mystras, Laconia
Set on the slopes of Mount Taygetus, Mystras is an extensive Byzantine settlement featuring fortified walls, palaces, monasteries and churches adorned with remarkable frescoes. Once a major political and cultural centre of the late Byzantine Empire, it offers a deeper understanding of medieval Greek history. Allow several hours to explore its steep paths and architectural treasures, particularly during the cooler months.
10. Astypalaia Castle, Dodecanese
Above the whitewashed houses and traditional windmills of Astypalaia’s Chora, Querini Castle creates one of the Aegean’s most distinctive island landscapes. Built under Venetian influence, the weathered fortress overlooks the surrounding sea and the island’s compact main town. Visit in the late afternoon before enjoying dinner on a terrace overlooking the illuminated settlement.
Planning a Castle-Focused Trip to Greece
For a mainland journey, combine Nafplio, Mystras, Monemvasia, Methoni and Koroni over seven to ten days, using a rental car to explore at your own pace. Spring and autumn offer pleasant conditions for walking around hilltop fortifications.
For an island-focused itinerary, Rhodes, Corfu and Astypalaia each offer a different perspective on Greece’s maritime history, although their distances make separate trips more practical. Check opening hours and seasonal access arrangements before visiting.
Ultimately, Greece’s great fortresses are more than monuments to the past. They are gateways to historic towns, spectacular coastlines and landscapes shaped by centuries of competing empires. Allow time to explore the places surrounding their walls, and each castle becomes a destination in its own right.
