Round Hill (Located in Dartmouth) was the site of early-to-mid 20th century research into the uses of radio and microwaves for aviation and communication by MIT researchers. It is also the site of the Green Mansion, the estate of "Colonel" Edward Howland Robinson Green, a colorful character in his own right, who was son of the even more colorful and wildly eccentric Hetty Green, said to be the richest woman in the world in her time, who is listed in the Guinness Book of Records as the "world's greatest miser". In 1936 the Colonel died, and the estate fell into disrepair as litigation between his wife and his sister continued for eight years over his vast fortune. Finally, Mrs. Hetty Sylvia Wilks, the Colonel's sister, was ruled the sole beneficiary. In 1948, she bequeathed the entire estate to MIT, which used it for microwave and laser experiments.