Danny Forster explores a $50 billion expansion to New York City's public transit system. It adds 2 new subway lines, 18 subway stations, a rail tunnel, and an underground expansion to Grand Central Terminal.

Danny visits the construction sites of the Heydar Aliyev Cultural Centre and the Baku Flame Towers in Baku, Azerbaijan to learn about the construction techniques for these unique buildings.

The $2 billion Mumbai Airport Expansion project is one of India's most ambitious undertakings ever. If they succeed, it could completely change the way airports are designed.