Arriving in Berlin at around 3:30pm, we reserved our seats for the next train and got the S- and U-Bahn to our hostel. If you are planning on Interrailing, DEFINITELY reserve seats for the following train if travelling in the height of summer. As I write this on the train to Prague, there is chaos in the carriage as people without reserved seats get kicked out of seats that were reserved. Hours of travelling with nowhere to sit is certainly not ideal after miles of walking in every city. For the remainder of our first day, we wanted to get a feel for the city, so we hopped back on the train once depositing our bags at the hostel and went into the centre. Groups of five or below should buy the Klein group ticket- it works out at €3,46 if dividing the cost between five people for unlimited travel on the U- and S-Bahns for 24-hours. We visited the Holocaust Memorial, with 2,711 columns that increase in size as you go further through the site, reflecting the overb...