Despite the ever-increasing number of operators (and embarkation points) from which to choose, most of the boat lines offer similar itineraries, tracing the scenic route. In addition to the historic landmarks lining the Seine, travelers can’t help but notice the many splendid bridges which span the river (35 in all), some of them several centuries old and designated as Historical Heritage sites in their own right.Boats leave from the Port de la Bourdonnais near to the Eiffel Tower or from the wharf alongside Notre Dame cathedral.Most of the boats are equipped with a text display and an audio announcement system, synchronized to the boat’s movement and providing commentary on the passing sights in several different languages. A night-time cruise is perhaps the most stunning: the boats are equipped with huge floodlights illuminating the riverside monuments, so bright that their glow is visible throughout the city on cloudy or foggy nights.