The document summarizes the construction of the Panama Canal and Los Angeles Aqueduct. The Panama Canal took over a decade to complete and cost hundreds of millions, but cut shipping time in half between the east and west coasts of the United States. The Los Angeles Aqueduct brought water from the Owens Valley to LA, fueling the city's growth and transforming its landscape, though it damaged the environment of the Owens Valley. Both projects required massive coordination and labor to build complex infrastructure on an immense scale.