Question: What site that had its construction begin before 1734 is a sight to see in Madrid?
Answer(s):
answer: El Escorial

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.056_y)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.056_y ns:travel.travel_destination.tourist_attractions ?x .
?x ns:architecture.structure.construction_started ?num .
FILTER (?num < "1734"^^xsd:dateTime) . 
}