For some, Dubai is a surprise addition to our list. But this flashy upstart of a city ranks for the fearless ambitions that have spawned row upon row of stunning skyscrapers, 120km (75 miles) of glistening artificial coastline including islands shaped as date palms, and hotels of such luxury they can spoil you for life. It's also a world-class destination for shopping, and beyond the glitz and glamour, Old Dubai retains its soul with coral courtyards and palm-frond fishermen's' huts.