It is designed to be one of the most sustainable on the planet. With a solar power station at its heart and wind farms providing energy for it, it aims to be carbon free.
Unsurprisingly, it is also a hub for clean-tech companies.
Sensors are on everything in Songdo - for example, escalators only move when someone is on them.
Offices and schools are also connected to the network.
Every home has a telepresence system built in like a dishwasher. As well as allowing users to control the heating systems and locks, it offers video conferencing and is intended as a way to deliver education, health care and government services.