It 's a grueling job , but it 's Work on Fort Jefferson , 70 miles past Key West , began in 1846 . Because of advances in artillery , the fort became obsolete before it was even finished . Though never attacked in wars , hurricanes and salt air have taken their toll . The last major hurricane to hit Florida came in 1928.
Work on Fort Jefferson , 70 miles past Key West , began in 1846 . Because of advances in artillery , the fort became obsolete before it was even finished . Though never attacked in wars , hurricanes and salt air have taken their toll . The last major hurricane to hit Florida came in 1928.