When was the original Yankee Stadium built?
The original Yankee Stadium was opened in 1923.
The new Yankee Stadium was built in 2008-2009 and open for the 2009 season. The old Yankee Stadium (the house that Ruth built) was dedicated in 1923. Prior to that, the Yankees (known as the Highlanders then) played at Hilltop Park, in 1913 the Yankees moved to the Polo Grounds (also home to the New York Giants) and played there until Yankee Stadium was built in 1923.