Early Remain behind Stepped Retaining Wall. Early Remain behind Stepped Retaining Wall; Early Wall Trench. Early Remain behind Stepped Retaining Wall; Pocket in Bedrock. Heliaia Enclosure Wall. Heliaia ... Κ-14 2799, 2800 ... Early Foundation Trench inside Peristyle of Heliaia ... Poros Aqueduct ... Poros Aqueduct; Course to South of Heliaia