 Complete the following phrase:  During these decades, parallel stadium developments were taking place in the U.S. The Baker Bowl, a baseball park in Philadelphia that opened in its original form in 1887 but was completely rebuilt in 1895, broke new ground in stadium construction in two major ways. The stadiums second incarnation featured the worlds first cantilevered second deck tier in a sports venue, and was the first baseball park to use steel and brick for the majority of its construction. Another influential venue was Bostons Harvard Stadium, built in 1903 by Harvard University for its American football team and track and field program. It was the worlds first stadium to use concrete-and-steel construction. In 1909, concrete-and-steel construction came to baseball with the opening of Shibe Park in Philadelphia and, a few months later, Forbes Field in Pittsburgh. The latter was the worlds first three-tiered sporting venue. The opening of these parks marked the start of the jewel box era of park construction. The largest stadium crowd ever was 199,854 people watching 