Is that vast labyrinth beneath London the Eighth Wonder of the World or the Ninth Circle of Hell? I’ll admit to a bias. As a longtime commuter on the infernal Long Island Rail Road and a rider of a subway whose signs are in fluent fuhgeddaboudit, I know what I like in a train system. Even as an American pre-teenager growing up in London, I marveled at the Underground and navigated it alone with ease and awe. I’m opting for Eighth Wonder.