Christian and Doris Müller from Buenos Aires, Argentina, are visiting Berlin. The couple emigrated from Germany to South America 12 years ago. Now they’re back in their native country as tourists, sightseeing in the German capital. Discover Germany went with them to Checkpoint Charlie, the Daimler Chrysler building high above Potsdamer Platz and the Brandenburg Gate. The Müllers wanted to visit Deutsche Welle’s premises as well and see the Discover Germany studio, a wish that we were able to fulfil.