Cities. The way cities are designed, built, operated. I am actually trying to see if I can build a company around this. It's the biggest challenge I can possibly imagine for me, and I don't know why I haven't given up yet :)

Cities help people connect (in a physical way), and help companies provide goods and services to them in a more efficient way.

However, cities today are maintained, operated, and enlarged based on legacy. I think there are huge inefficiencies, and yet it seems that trying to fix existing ones is a nightmare.

What about NEW ones instead?

I find this extremely interesting. We'll see.