Many people travel to New York City for its world-renowned skyscrapers, and while this city was once the center of commerce, industry, and communication, it now boasts some of the world's highest buildings. In fact, New York's skyscrapers used to be the tallest in the world - the Empire State Building and Chrysler building were once the highest buildings in the world. Its thriving business and arts communities helped make it one of the world's most cosmopolitan cities. In addition, New York City's subway system has 422 stations, and its railroad network was the first in the USA, with 11 miles of track. Among the city's many other attractions, New York's Adirondack Park is the largest in the contiguous USA, with six million acres, more than the entire Yellowstone National Park.