You may think if you own a home you can do what you want with it - not so in Berlin. If you'd like to rent out your home to holidaymakers you could face a hefty fine. We'll be finding out why. Obama was in town to reinforce German-American ties and encourage citizens here to support the transatlantic trade deal TTIP. Yet around 70 percent of Germans are against the deal. Rob is going underground to check out the bunkers of Berlin. Take a listen in our Destination Germany segment.