Manhattan by the construction of the Willis Tower in 1974 (formerly known as the Sears Tower, located in Chicago). One World Trade Center, a replacement for the Twin Towers of the World Trade Center, is currently the tallest building in the Western Hemisphere. In 1961, the Pennsylvania Railroad unveiled plans to tear down the old Penn Station and replace it with a new Madison Square Garden and office building complex. Organized protests were aimed at preserving the McKim, Mead & White-designed structure completed in 1910, widely considered a masterpiece of the Beaux-Arts style and one of the architectural jewels of New
Metropolitan Tower (Chicago) of this ornament, the building is sometimes referred to as the "Beehive Building." Just beneath the beehive are four carillon bells ranging in weight from 1,500 to 7,000 pounds, unused for many years until restored in 1979 for the Chicago visit of Pope John Paul II. At one time, the bells chimed the well-known Cambridge Quarters on the quarter-hours. The base has been altered from its original design: rectangular window openings replaced giant arches on Michigan Avenue and Jackson Boulevard. At one time, the thirtieth floor was the Straus Tower Observatory, which was open to the public for viewing the