The world’s tallest building, Burj Khalifa, in downtown Dubai, United Arab Emirates

The world’s tallest building, Burj Khalifa, in downtown Dubai, United Arab Emirates

Jens Neumann/Edgar Rodtmann/National Geographic ©

The world’s tallest building, Burj Khalifa, in downtown Dubai, United Arab Emirates

The world’s tallest building, Burj Khalifa, in downtown Dubai, United Arab Emirates

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