By 2023, Turkey wants to dig itself a new canal connecting the Black Sea to the Sea of Marmara. It'll involve moving a billion cubic meters of dirt from somewhere to somewhere else, and if that somewhere else ends up being a new island like one Turkish developer wants, it would form a beautiful, sustainable paradise for hundreds of thousands of people.
HavvAda Island would be a lot more than an offshore dumping ground for used dirt. It would be a community for 300,000 people built around six hills with a gigantic kilometer-wide amphitheater in the middle. Each hill is actually a geodesic dome, with a "mesh" stretched over it to support soil, plants and residences with nice views. The interior of the domes are hollow, of course, and each is dedicated to a different focus, including creativity, logic, family, health, physical and business, while the amphitheater in the middle is for "digestion," which means that's where you go to buy stuff.
Like every single concept these days, HavvAda Island is self-sustaining and in fact produces more energy than it consumes. For example, instead of using Earth-hating air conditioners to keep cool, HavvAda would pump seawater through a chilled water ring to deliver coolness all across the island. Waste would be sucked away through a network of pneumatic tubes for recycling, while the energy to power everything would come from an offshore wind farm along with solar panels on the slopes of the island itself.
Your guess is as good as ours as to whether something like this is realistically possible, but Turkey is planning on building this canal, and all of that dirt does have to go somewhere, so why not make a megastructure out of it? Yes, it'll be expensive, but what with all of those royalties that Turkey collects over Thanksgiving, they should be able to afford it no problem. Right?
Catch a video of the HavvAda Island concept in action (or in as much action as you can expect from a big pile o' dirt), below.