For nearly a decade, Dan Buettner has researched the places people live longest, healthiest and happiest.
Europe’s debt crisis hasn’t just been ruining lives for people across the continent, it has also been changing where people can live and work.
The latest figures show that an increasing number of people – especially young people – are migrating to Germany, where the economy is doing relatively well.
They come from the countries in southern Europe that have been hit hard by the economic downturn.
In the first half of 2012, immigration from Spain to Germany increased by more than 50 percent compared to the same period a year ago.
The BBC’s Europe correspondent Matthew Price reports from Cologne, on the new wave of migration caused by Europe’s debt crisis.