16 Merry Hill Ct. is a 19th-century mansion near Stevenson that has 25 rooms on nearly 3.5-acres. The Georgian home is listed for $4,250,000. (Courtesy of Maryland Image House)
It was the country estate of the late Robert Brent Keyser, once president of Johns Hopkins University's board of trustees, whose family helped establish the school's Homewood campus in 1914.