Question: What tourist attractions in Houston, Texas were opened before October 6, 2003?
Answer(s):
answer: George R. Brown Convention Center
answer: Space Center Houston
answer: The Galleria
answer: Rothko Chapel
answer: Bayou Bend Collection and Gardens

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.03l2n)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.03l2n ns:travel.travel_destination.tourist_attractions ?x .
?x ns:architecture.structure.opened ?num .
FILTER (?num < "2003-10-06"^^xsd:dateTime) . 
}