New York CIty is known as one of the rattiest cities in America with some estimating close to two million rodents roam its streets. Providing look at how New York City manages it's rodent population.

Underneath the ground of New York's fabled streets exists a vast network of pipes that make up the city's sewer system. New Yorkers create, on average, 1.3 billion gallons of wastewater per day that makes its way through these 7,500 miles of pipes.

The Brooklyn Bridge and the George Washington Bridge are engineering marvels that have helped set the tone for how bridges around the world are designed. A look at how New York builds and maintains its aging bridges.