The estimation of subway travel times from any one point in the city is probably something you’ve never thought of for more than a few seconds, but we wish that we had. Covering most of the city, they can take you pretty much anywhere for $2.75. Tunnels and bridges connect boroughs across water, but for the most part, this city’s enormity is made small by the subway lines that spread like webs from the busiest centers of town to the furthest reaches of the Bronx, Queens, and Staten Island.