Question: Which of Albert Speer's designs opened most recently?
Answer(s):
answer: Olympiastadion

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0l4t)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0l4t ns:architecture.architect.structures_designed ?x .
?x ns:architecture.structure.opened ?num .
}
ORDER BY DESC(?num) LIMIT 1