New Delhi, June 10 -- The ferry glides from one bank of northern Italy's Adda River to the other, guided by a cable and pulled by currents, offering harried commuters five minutes of serenity and an alternate route now that a bridge closure has backed up traffic.

Called "Leonardo's Ferry,'' the mechanism of the so-called reaction ferry was designed five centuries ago and immortalized by the Renaissance genius himself in a drawing preserved in Windsor Castle's Royal Collection outside of London.

It is the last remaining of its kind along the Adda River, which extends from the Alps to the Po River in the Lombardy region.

"This is a mean of transport that has been here for 500 years and has always connected the two banks of the Adda," sai...