The Sea Gate (Greek: Θαλασσινή Πύλη, Italian: Porta Marina) is one of the most famous and impressive gates of the medieval fortress of Rhodes, located in Greece. Situated in the southern part of the Old Town, it opens directly onto the harbor, historically serving as the main entrance for all who arrived at the island by sea—be they noble guests or merchants. These gates are considered a true symbol of knightly Rhodes and one of the first architectural masterpieces to greet travelers.

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The monumentality of the Sea Gate is undeniable. Its design features two powerful round towers crowned with battlements typical of medieval defensive architecture. The gate's appearance reflects its vital role in defending the city while showcasing the craftsmanship of the era's builders. Passing through them is like stepping back several centuries into the time of knights and naval battles.
The Sea Gate is an integral part of the grand fortification system of the Old Town of Rhodes, which is rightfully included in the UNESCO World Heritage list. Its architecture and decoration show traces of influence from various cultures and historical periods, but the legacy of the reign of the Knights of the Order of St. John is most prominent. Visiting these gates is an opportunity to touch the rich history of the island and feel the spirit of the Middle Ages.