7. New York City Subway – NYC
New York City Subway, one of the world’s oldest metro stations, was first opened in 1904. It’s the preferred transportation option for city dwellers who travel amongst the four boroughs. The subway cars have become synonymous with the street performers who serenade travelers and the occasional hilarious hijinks that occur during late night hours. The colorful passengers make the subway city what it is today, so it’s not shocking that the system saw an annual ridership of 1.757 billion in 2016.