Question: Where is the tombstone of the congressman who died in the McLean hospital?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/deathPlace> <http://dbpedia.org/resource/McLean_Hospital> . ?x <http://dbpedia.org/property/restingplace> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Congressman>}