With its shiny silver hull and space-age helm chair, the Riva 63' Vertigo is a sleek creature indeed. The $3.5-million vessel, which occupies the middle of the Italian builder’s line of 15- to 115-foot motor yachts, made its U.S. debut in February. When it flies across the water at its top speed of 46 mph, it is sure to turn heads, if not remove them from necks.
