Mat Roy Thompson
Roy Thompson , Roy Thompson , and Leroy Thompson , was a civil engineer and architect who worked on a great variety of construction and development projects across the United States , most notably on Scotty's Castle , the Death Valley mansion of eccentric millionaire Albert Mussey Johnson . 
<triplet> Scotty's Castle <subj> United States <obj> country <triplet> Death Valley <subj> United States <obj> country