Centres of wealth, power, industry and innovation such as London, Tokyo, Hong Kong and New York never sleep, and the influence held in these economic hubs unites the global community.

Mega Cities provide a bustling home to populations reaching over 10 million; the high-density living of Shanghai and Bangkok and the sprawling cities of Delhi and Mexico City each provide a backdrop for dynamic cultures.

Swarming with visionaries, politicians and activists, metropolises such as Dublin, Washington and Taipei are defined as the official seats of government.

Port cities make up some of the busiest cities in the world. Great maritime metropolises bridge not only countries but continents as well, uniting the global community.

In Ancient Cities, we journey to these ancestors of influence such as Luang Prabang, Vienna, and Istanbul where religious and cultural centres have shaped the ways in which we view the world around us and continue.

More than distant trading posts and isolated regional hubs, cities such as Alice Springs, Perth, Jaipur and even Las Vegas serve as gateways to the planet's wild places.