Question: What attraction, located on Heart Island, was built by the G. W. & W. D. Hewitt architectural firm?
Sentence (from "G. W. &amp; W. D. Hewitt"): The last was built for George C. Boldt, owner of Philadelphia's Bellevue-Stratford Hotel (1902–04), G.W. & W.D. Hewitt's most well-known building.
Relevant evidence: No