Berlin is a big city. And if you’re like me, you flew over with a few landmarks to see in mind, but without an established plan of action to tackle them all, let alone figuring out which actually merit a visit. Furthermore, if you have a few other cities to visit during your Eurotrip, and only have a day or two in Berlin (because let’s face it, it was one of the cheapest hubs to fly into), then you’re going…