Bridge of Change (Pont au Change) over river Seine and Concierge Published December 1, 2016 at 300 × 175 in Bridge of Change (Pont au Change) over river Seine and Concierge Bridge of Change (Pont au Change) over river Seine and Conciergerie Castle. Castle Conciergerie is a former prison, located on west of the Cite Island and today it is a part of Palais de Justice, Paris, France