Trans-Siberian Railway, Russia

The Trans-Siberian Railway spans 9,289 kilometers from Moscow to Vladivostok, crossing seven time zones and connecting cultures across a continent. Its sheer scale delivers a depth of human and natural variety that no other train can match, which is why placing it at #2 will infuriate purists who insist nothing else comes close. Over 90% of travelers report that theLake Baikal segment alone justifies the entire trip.