Chris talks to gauchos in the Pampas lowlands, meets Falklands veterans in Bahia Blanca, and takes in the beauty of Patagonia.

Documentary series in which Chris Tarrant explores the world's most extreme railway lines. Chris travels on the historically Soviet Trans-Caucasus Railway, beginning in the Azerbaijani city of Baku before exploring the Geogian capital Tbilisi's vintage metro system, then a mountain rail bridge designed by Eiffel, and finally a tunnel reputed to be held together with egg yolk.