From Practical Engineering:

Traffic management in dense urban areas is an extremely complex problem with a host of conflicting goals and challenges. One of the most fundamental of those challenges happens at an intersection, where multiple streams of traffic - including vehicles, bikes and pedestrians - need to safely, and with any luck, efficiently, cross each others’ paths. However we accommodate it now or in future, traffic will continue to be one of the biggest challenges in our urban areas and traffic signals will continue to be one of its solutions.

In 1956, Frank Lloyd Wright proposed the Illinois Sky-City, a skyscraper taller than one mile (~1,600 meters). That's more than twice the height of Dubai's Burj Khalifa, currently the tallest structure in the world. In the video above, Dutch architest Stefan Al asks "Will there ever be a mile-high skyscraper?"

If it happens, there should be a rooftop bar named... the Mile-High Club.

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