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"): It was founded in Philadelphia in 1878, by brothers George Wattson Hewitt (1841–1916) and William Dempster Hewitt (1847–1924), both members of the American Institute of Architects.
Relevant evidence: No