Sardinia is home to one of the world's rare "blue zones" where a greater number of people live to 100 or more. The zone consists of a cluster of villages on the Italian island, which bluezones.com says are inhabited by locals with a rare genetic "quirk" linked to exceptional longevity.

The blue zone areas of Ogliastra, Barbagia di Ollolai and Barbagia of Seulo are home to one of the world's greatest concentrations of people who live to 100 or more. However, according to bluezones.com, it's not just because of "undiluted" genes that some locals live to such a ripe old age, but also because of lifestyle habits.