Public transit times in major cities

Here is an interesting visualization..

http://flowingdata.com/2014/01/27/public-transit-times-in-major-cities/

You can select the time of the day and day of the week,  and get a realistic estimate of how long it takes to get from point A to point B. There is also an interesting comparison option, which lets you choose two locations to see which area will get you somewhere else faster.