Question: What strucure opened before 1861-10-18 and is located in Liverpool England?
Answer(s):
answer: St George's Hall, Liverpool
answer: Albert Dock

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04lh6)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04lh6 ns:travel.travel_destination.tourist_attractions ?x .
?x ns:architecture.structure.opened ?num .
FILTER (?num < "1861-10-18"^^xsd:dateTime) . 
}