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Inspired by New York’s High Line, the Lowline project aims to transform an unused trolley terminal into the world's first underground park. Using advanced technology to direct natural light below ground, plans include cultivating plants and trees within a unique green space.
Underground City, Helsinki
Helsinki's underground igloo is a city beneath a city, with over 500 facilities and 300 kilometers of tunnels designed to shelter its population in times of crisis. Capable of housing 750,000 people, the area features recreational and essential facilities with advanced utilities.