So incredibly flat that it is barely visible, and often described merely as looking like a darker blue line in the sea, Pianosa was first inhabited in the late Stone Age and then was a Roman settlement before Pisa and Genoa began to fight over the land in the 12th and 13th centuries. Variously inhabited by pirates, fishing colonies, and military officers, the island became a maximum security prison in 1868 and remained home to prisoners, with many particularly dangerous Mafia criminals among them, until 1998. Upon the closure of the prison, almost everyone left with just a few people remaining on the island today.

