Hastings' Dictionary of the Bible (1898)
TOWER. Matt. 21:33. Towers were common in vineyards, Isa 5:2, and are often seen at the present day. They are sometimes 30 feet square and 60 feet high, and are a kind of pleasure-house, serving as a shelter for the watchmen and as a summer retreat for the owner, affording an extensive prospect and fresh air.