query: SELECT ?item ?itemLabel ?wlmid ?coord
  WHERE {
    ?item wdt:P2186 ?wlmid. 
    ?item wdt:P17 wd:Q41. # in Greece
    MINUS { ?item wdt:P31 [] } .
    OPTIONAL {?item wdt:P625 ?coord .} # geographic coord
    SERVICE wikibase:label { bd:serviceParam wikibase:language "el,en". }
  }
  ORDER BY ?itemLabel