If you want to travel between two of the biggest cities in France and Italy, it might look quite simple at first — Lyon and Turin are only separated by a few hundred kilometres... but there’s the small matter of the Alps in the way and trains take around four hours to cross them. That is until the the 270-kilometre Lyon-Turin Railway arrives in 2032. The engineering in the 57.5-kilometre Mont Cenis Base Tunnel alpine tunnel is CRAZY.

Later in the show, we look at Saudi Arabia's 400-metre tall cube-shaped skyscraper being built in Riyadh. "The Mukaab" will rise as the centrepiece of a new 19-square-kilometre district called Murabba that's set to comprise over 25 million square metres of floor area and create 104,000 homes. Further into the segment we add our thoughts to the current 15-minute City debate that's currently going on. Also, we chat about Bjarke Ingels Group's "leaning" Qianhai Prisma Towers that are set to be constructed in China.

We end the show with an email from Alan Price AND a cheeky Apple Podcasts review from Rijowhi.

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284: Building Smart Communities