10. Dubrovnik, Croatia

Approaching this city on Croatia’s Adriatic coast, vivid aquamarine water splashes the rocky coastline as Dubrovnik’s historic red-roofed center — encircled by a dramatic 14th-century wall — draws you in with its subtle golden glow. There’s something magical about anchoring in the harbor and tendering in, as your gaze shifts from medieval watch tower to bell-topped church steeple to café-lined harbor.