A man’s home is his castle. But for Dr. A.G. Castles, his home was quite literally a castle: The eccentric art collector built a pair of royal residences across the street from each other on Argyle Avenue, his 30-acre kingdom. Glengarry Castle on Argyle Avenue (USC) The first, Glengarry, was completed in 1909 and earned recognition as one of the noteworthy mansions of the Hollywood foothills. Its competition, Holly Chateau (now Magic Castle), was designed by the same architec