query: #Museums in the Netherlands
  SELECT ?item ?itemLabel ?cityLabel
  WHERE 
  {
    ?item wdt:P31 wd:Q33506 .
    ?item wdt:P17 wd:Q55 .
    OPTIONAL {?item wdt:P131 ?city .}
    SERVICE wikibase:label { bd:serviceParam wikibase:language "nl,en". }
  }