Bavljenac Island, Croatia

This 'fingerprint' is one of a kind

Of the 1,246 islands on Croatia's fragmented coast, the unique isle of Bavljenac might be the most identifiable. It's nicknamed Fingerprint Island after its miles of dry-stone walls that look like, well, a human fingerprint. The tiny, uninhabited landmass in the Adriatic Sea was once an agricultural centre. In the 19th century - the heyday of Croatian wine production - farmers from the nearest populated island built the winding walls on Bavljenac to protect olive trees and grapevines from the winds blowing in from the Adriatic. Although grapes are no longer grown on Bavljenac, many olive trees still stand alongside the stone walls.