Kastellorizo, officially Megisti, occupies a small island close to the Anatolian coast at the eastern edge of the Greek world. Archaeological evidence indicates human presence from prehistoric times, while the harbor's shelter made it useful to sailors moving between the Aegean, Cyprus, and the Levant. Ancient settlement was tied to Rhodes and later passed through Roman and Byzantine political systems. The island's limited land encouraged residents to look outward, combining small-scale agriculture with fishing, navigation, and regional exchange.

A medieval fortress rose above the harbor and was held at different times by Byzantine authorities, regional rulers, and the Knights of Saint John. The name Kastellorizo is generally associated with the red-colored castle, although its precise linguistic development is debated. Ottoman power reached the island in the sixteenth century, but local maritime activity continued. Churches, lanes, cisterns, houses, and waterfront structures gradually formed a dense settlement whose architecture responded to steep terrain, scarce water, and the need for access to boats.

During the eighteenth and nineteenth centuries, Kastellorizo prospered through shipping, commerce, sponge fishing, and connections with ports across the eastern Mediterranean. Merchant and captain families built colorful multistory houses around the harbor, while schools and churches expressed communal wealth. The town's population greatly exceeded that of the present island, and its vessels carried goods far beyond local waters. Economic success depended on mobile labor and family networks linking island households to Anatolia, Egypt, the Levant, and other Greek communities.

The twentieth century brought rapid political change and destruction. French forces occupied the island during the First World War, Italy later governed it with the Dodecanese, and wartime bombing damaged the settlement. In 1944 a catastrophic fire destroyed stores and houses after most civilians had already been evacuated. Many residents settled permanently in Australia and elsewhere rather than return. Kastellorizo joined Greece with the other Dodecanese islands in 1948, but depopulation left numerous harbor houses ruined or empty.

Restoration, tourism, and renewed connections with the diaspora have revived parts of the old town while preserving evidence of loss. The waterfront remains a living settlement of houses, churches, public buildings, cafés, and boat facilities beneath the castle ruins. Conservation must address salt, seismic risk, seasonal pressure, abandoned structures, and the temptation to present a uniform picturesque façade. Kastellorizo's significance comes from its maritime society: a tiny island built an international commercial community, endured repeated transfers of rule and wartime catastrophe, and retains an architectural identity sustained as much by emigrants' memory as by permanent residents.