Jetting into Hingham Harbor lies a cluster of drumlins, glacier-carved, spoon-like, hills that rise above the coast around it. John Brewer purchased the land in the 19th century and built an estate for raising cattle. Within 30 years the peninsula was entirely owned by the Brewer family. At the end of the 1800s, the family contacted Frederick Law Olmstead, a famous architect now known for his role in the creation of New York City’s Central Park, as well as several other iconic parks of the United States, such as Niagara…