In all the states which have a Uniontown, where does a Keller's mill covered bridge exist too?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Uniontown,_Pennsylvania> <http://dbpedia.org/ontology/state> ?uri. <http://dbpedia.org/resource/Keller's_Mill_Covered_Bridge> <http://dbpedia.org/ontology/state> ?uri . }
Uniontown,_Pennsylvania Keller's_Mill_Covered_Bridge