Tempelhof is not just a park with a different story. It's quite a powerful symbol of modern Berlin. I was lucky to take part in a tour around the insides of the airport, discovering what the former American military base left inside the unused building. Let me tell you: it's as phenomenal from the inside as much as from the outside. Basketball courts and former bowling alleys, little forgotten bunkers and shelters-- had this building not been an airport, it would still be fascinating. I didn't even know the hallways were open to the public (I think you're obliged to book a tour though).