The Marcellus aqueduct

 Believe or not, this aqueduct built in the second century AD, is still bringing water to Rome. It's one of many and. of course, the oldest one. The water is called acqua marcia.

A little history lesson.

Marcus Claudius Marcellus , five times elected as consul of the Roman Republic, was an important Roman military leader during the Gallic War of 225 BC and the Second Punic War. Marcellus gained the most prestigious award a Roman general could earn, the spolia opima, for killing the Gallic military leader and king Viridomarus in hand-to-hand combat in 222 BC at the Battle of Clastidium. Furthermore, he is noted for having conquered the fortified city of Syracuse in a protracted siege during which Archimedes, the famous Sicilian thinker. who was considered to be the greatest mathematician of ancient history, and one of the greatest of all time was killed by a Roman soldier. Archimedes was pointing a concave mirror to the Roman ships and thus burned a few. To his credit, Marcellus having seen this outrage immediately killed the soldier. Archimedes anticipated modern calculus and analysis by applying concepts of infinitesimals and the method of exhaustion to derive and rigorously prove a range of geometrical theorems, including: the area of a circle; the surface area and volume of a sphere; area of an ellipse; the area under a parabola; the volume of a segment of a paraboloid of revolution; the volume of a segment of a hyperboloid of revolution; and the area of a spiral. The most important of his contribution was the concept of displacement or buoyancy.