Here's a riddle: how many mooring chains does it take to screw in
a lightbulb the world's largest artificial island? Thanks to Viva, the just-opened artificial island in Seoul, South Korea, we know for sure: 28. At more than 35,200 square feet, Viva is its own sort of architectural enclave, complete with a neon 700-seat convention center, parks, and outdoor terraces. It's one of three artificial islands set to be built in the complex Seoul that will total nearly 220,000 square feet when all is said and done.