Platanos is the historic capital of Leros. Narrow streets, traditional houses, small cafés and attractive squares give it a distinctly Greek island atmosphere, while many elegant neoclassical mansions reflect the island's prosperous past. Above the town stands the imposing Castle of the Knights of St John, one of the island's most important landmarks. The climb is well worthwhile for its panoramic views and impressive medieval fortifications.
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The Archaeological Museum of Leros displays finds from the island's long history, from prehistoric and classical times through to the Hellenistic period. Highlights include ancient pottery, inscriptions, sculptures and everyday artefacts discovered at archaeological sites across Leros.
Leros' most impressive historic monument and one of the best-preserved medieval castles in the Dodecanese. Built on the site of an ancient acropolis, it was extensively fortified by the Knights Hospitaller during the 14th century. The castle offers spectacular panoramic views.
The island's main harbour and commercial centre, with a waterfront lined with cafés, tavernas and local shops. Fishing boats and visiting yachts create a lively atmosphere. Many of the surrounding buildings date from the Italian period. Although Agia Marina and neighbouring Platanos have grown together, each retains its own character. Agia Marina is also home to the Archaeological Museum and serves as a convenient base for exploring the rest of the island.