Question: What is the structure to visit in Peoria, Illinois that opened before 1982?
Answer(s):
answer: John C. Flanagan House Museum

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0sf9_)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0sf9_ ns:travel.travel_destination.tourist_attractions ?x .
?x ns:architecture.structure.opened ?num .
FILTER (?num < "1982"^^xsd:dateTime) . 
}