The World’s Largest Storm Water Tank Is Hidden Under A Golf Course In Madrid
The storage tanks in Arroyofresno and Butarque are capable of holding an astonishing capacity of 400,000 m³ of water and are some of the largest in the world. https://euroweeklynews.com/2023/09/04/largest-storm-tank-world-under-golf-course-madrid/Reply on topic: Underground city, gambling restrictions and largest hotel
https://www.helsinkitimes.fi/world-int/world-news/finland-in-the-world-press/20081-underground-city-gambling-restrictions-and-largest-hotel-finland-in-the-world-press.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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