From Willis Tower to One World Trade Center, skyscrapers are emblematic of the world’s great cities. Since their beginnings in the late 19th century, these tall towers have constantly evolved as architects and structural engineers pushed the boundaries of what’s possible. The new Science Channel series, SKYSCRAPERS: ENGINEERING THE FUTURE, puts the spotlight on what the world’s most ambitious cities are doing to transform their skylines with designs that seem to defy gravity.