Down an easily-missed alley near Campo Manin, this delicate brick-and-stone spiral staircase ('bovolo' = snail-shell) winds up an open courtyard tower to a loggia with a rooftop view — a charming, low-key 'secret Venice' find. The catch: it's small and quick, the climb is a tight spiral, and now that it's on the 'hidden gems' lists it's no longer truly secret.