India

Mumbai's Dharavi is one of the most productive slums in the world, generating over $1 billion annually.

Delhi has been continuously inhabited for over 5,000 years and has served as the capital of at least seven consecutive empires, giving it more historical layers than almost any city on Earth.

Varanasi is one of the oldest continuously inhabited cities in the world — over 3,000 years old. Mark Twain wrote: 'Benares is older than history, older than tradition, older even than legend.'

Ahmedabad was India's first UNESCO World Heritage City (2017). Mahatma Gandhi launched the Dandi Salt March from Sabarmati Ashram here in 1930 — you can visit the ashram today.