How circadian rhythms and Roman baths are transforming Australian cities

The team behind the next generation of sustainable buildings, including Sydney's Barangaroo, aim to promote wellness along with preventing environmental harm

Hidden beneath Federation Square, the heart of civic Melbourne, is a complex labyrinth of concrete cells.

This labyrinth - the world's largest de-coupled airside thermal storage system -acts like a rechargeable battery. On summer evenings it stores cool night air to use during warm days and, in winter, daytime heat to use at night.The apparatus was inspired by Roman bath and cave systems used more than 2,000 years ago that fed naturally cooled air to ancient villas in northern Italy.