Nerantzia Castle

The majestic Neratzia Castle, also known as the Castle of the Knights of St. John, greets every traveler arriving at the harbor of Kos town. This grand medieval structure in Greece is considered one of the region's most significant historical landmarks, recalling the era of the Crusades and knightly valor.

The fortress is a unique architectural ensemble—a "castle within a castle"—consisting of two defensive rings connected by a massive stone bridge over a deep moat. In the past, this moat was filled with seawater, turning the citadel into an impregnable island. Built on the ruins of ancient structures, Neratzia harmoniously combines massive walls with elegant elements of ancient Greek architecture.

Neratzia Castle. Иллюстрация. Источник: Kupi.com AI

Today, the castle is an archaeological heritage site. Although time has turned part of its structures into picturesque ruins, the power of the four corner towers and the austerity of the fortifications still leave a lasting impression. This is a place where you can literally touch history, walking among centuries-old stones to the sound of the Aegean Sea.

For current information before visiting the fortress, you can use the following contact details. Please note that the site currently does not have an official website or public email address.

A visit to Neratzia Castle is, first and foremost, a chance to take an exciting journey back in time. Visitors can explore the massive battlements and watchtowers where knights once kept watch for approaching enemy ships. Be sure to notice the fortress gates, which still bear the coat of arms of Grand Master Pierre d'Aubusson, a symbol of the Hospitallers' rule.

As you walk through the grounds, you will see an interesting blend of styles: austere military fortifications stand alongside elegant Venetian buildings. Of particular interest are the ancient columns and marble blocks that the knights used to build the walls, repurposed from the ancient Asklepion that had been destroyed by an earthquake.

Beyond the stonework and embrasures, the castle attracts visitors with its panoramic views. From its walls, you get a magnificent view of the waterfront, the seaport, and the endless blue horizon separating the island of Kos from the coast of Turkey. It is a great place for quiet contemplation and capturing atmospheric photos against the backdrop of old cannons and the seascape.

Neratzia Castle is strategically located right at the entrance to the harbor at Akti Miaouli 4. Thanks to this location, it is one of the most accessible attractions for those staying in the island's capital or arriving by ferry. It is only a few minutes' walk from the city's main seaport.

If you are in the city center, the easiest way to reach the fortress is to walk along the picturesque waterfront. For tourists staying in more distant areas, taxis are available and can take you almost to the very entrance of the fortification complex. Public transport on the island is well-developed, and many bus routes pass through the city center, just a stone's throw from the castle.

The history of Neratzia Castle is inextricably linked with the Knights of the Order of St. John (Hospitallers), who began building this powerful outpost at the end of the 14th century. The main purpose of the citadel was to protect the island from constant threats. Construction lasted for nearly two centuries, and the fortress acquired its final appearance with external defensive walls by 1514.

An interesting architectural feature is the use of building materials from ancient ruins. The knights actively used blocks and columns from the ancient city of Kos and the famous Asklepion, fragments of which can still be seen in the masonry of the walls. Together with the fortress on the opposite shore (in modern-day Bodrum), Neratzia allowed the knights to fully control the sea route between Constantinople and Alexandria.

In the 19th century, when the island was under Ottoman rule, the castle served as a barracks for the garrison. During this period, specifically on March 17, 1816, a tragic incident occurred: a gunpowder magazine explosion destroyed a significant part of the internal structures. The modern appearance of the ruins is the result of painstaking work by Italian archaeologists, who carried out extensive restoration in the 20th century to return the monument to its historical form.

To leisurely explore all accessible corners of Neratzia Castle, study the architectural details, and take memorable photos of the harbor, most travelers need about 1–2 hours. This time is quite sufficient to see both the external fortifications and the inner courtyard.

If you are interested in the history of the Order of the Hospitallers or the architecture of medieval forts, you might want to stay longer to examine every coat of arms and ancient fragment built into the walls. However, for a general introduction during a walk around the city, a couple of hours is the ideal amount of time.

Currently, Neratzia Castle may be listed as CLOSED_TEMPORARILY for visits to the interior spaces. This is due to ongoing restoration or archaeological work periodically initiated to preserve the monument.

Nevertheless, an external view of this grand structure is available at any time of day. Visitors are strongly advised to check the current opening hours right before their visit by contacting the local tourist information center or using the official contact number, as the schedule may change depending on the season.

Exploring the surroundings of the fortress will allow you to dive deeper into the island's centuries-old history and see how closely different eras are intertwined. Just a few steps from the fortress walls begin the old quarters and archaeological zones that are definitely worth including in your itinerary.