Question: What structure in Ottwara opened before May 8th, 2005 and is open today?
Answer(s):
answer: CFS Carp
answer: Canadian Museum of Nature
answer: National Gallery of Canada

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05ksh)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05ksh ns:travel.travel_destination.tourist_attractions ?x .
?x ns:architecture.structure.opened ?num .
FILTER (?num < "2005-05-08"^^xsd:dateTime) . 
}