The document discusses several proposed futuristic cities around the world, including: - The LINE in Saudi Arabia, a 170km linear smart city with no cars or carbon emissions. - Telosa City in the US, planned as a renewable energy-powered 15-minute city between Nevada, Arizona and Utah. - BiodiverCity in Malaysia, an eco-friendly development built on islands as an "Urban Mosaic". - The Maldives Floating City, a 5,000 home development floating within a lagoon to address rising sea levels.