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SerpAPI
It's probably a bit odd to consider a landmark with almost a thousand reviews a hidden gem, but the viewing platform really does feel like an insider's tip for all visitors to the city. Or maybe I'm just saying that because it was my own first view of Berlin from above. Either way, if you're an acquaintance of mine and I catch wind of your visit to this corner of the world, I'm probably taking you here. You're welcome.