Stumbled on this site last week: http://radio.garden
It’s a 3D representation of the globe and you can scroll around the world and hover over a city, it will start playing a streaming radio station at random and also gives you a list of other stations in that location. I’m in Reykjavic listening to X-ið FM 97.7 today.
One thing I have found: many European stations play absolute shit. I did find a good retro station in Brussels, so I spent a day there last week. Radio X and BBC 6 Music (London) play a reasonable range of stuff in the early hours of their day.