Singapore ranked 3rd:
This sovereign city-state ranked in the top three for city gateway, transportation and infrastructure, and ease of doing business. Singapore made big advances in this year's edition of PwC's "Cities of Opportunity," going up four spots to third place and dominating transportation and infrastructure.
As the Lonely Planet travel guide notes, "Singapore has fantastic public transport, with a tangled web of bus and train (MRT) routes taking you to the doorsteps of most sights." It's also possible to island-hop near Singapore by taking one of the city's many ferries.
Singapore established superior infrastructure and transportation when it was a British colony prior to Protected content , according to the Encyclopedia of the Nations. In the '70s and '80s, the city-state reacted to increased traffic problems by investing heavily in its mass transit system.
While Singapore falls out of the top 10 in sustainability and the natural environment, it may do better on that front in the next PwC report. Just last month, The New York Times reported on a massive new green park in the middle of the city known as the Green Corridor.
The park was inspired by New York's High Line, but it's much bigger at 15 miles long.