This is no ordinary experience. On the Trans-Siberian, the train itself becomes its own fascinating world. Nowadays, it's a lot easier to stop off at some of the intriguing and historic towns along the way, including Yekaterinburg, Irkutsk, Ulan Ude and the Mongolian capital, Ulaanbaatar. But for many travellers, the special pleasure of the Trans-Siberian is simply being on board this legendary train and watching the vast emptiness of Siberia pass by from the window.