NEW YORK.- What will be in place of the Twin Towers in New York City? What can be built over Ground Zero? Artists and architects have given their own views on what to do in this space. The Max Protetch gallery in New York organized an exhibition with proposals by many architects.  It was a great success. This exhibition will now travel to Washington, D.C. and later to Paris. Stewart Krimko, from the Max Protetch gallery, stated, "People want to see what the site will lool like in the future."