The stone arch does not announce itself. It simply continues — span after span across flat agricultural land, indifferent to the centuries accumulating around it. The aqueduct near Nahariya in western Galilee, its kurkar limestone worn to the color of dry earth, carried water to the coastal settlements of ancient Ptolemais long before the Crusaders reinforced its arches and the Ottomans extended its reach. That layering is not incidental. It is the story of Roman hydraulic engineering in miniature: infrastructure so rationally conceived that every subsequent empire found it easier to inherit than to replace.

Jacques-Louis David completed The Oath of the Horatii in Rome in 1784 and exhibited it at the Paris Salon the following year. It stopped the room then. It still stops rooms now — visible here on the deep terracotta wall of the Louvre’s Denon Wing, large enough to command the gallery from any angle, the three brothers extending their sword arms toward their father in a gesture that has not lost its charge in two and a half centuries.

In the main hall of the Musée d’Orsay in Paris, beneath the vast iron-and-glass vault of the former railway station, stands a bronze that makes explicit what Gérôme’s paintings kept implicit. A man in contemporary nineteenth-century dress — smock, trousers, the clothes of a working artist — stands beside a Roman gladiator. The gladiator is armored, helmeted, standing over a fallen opponent whose arm is raised in the gesture of submission. The contemporary figure reaches toward the gladiator with a sculptor’s tool. This is Jean-Léon Gérôme’s self-portrait with his own creation: the artist inside the ancient world he spent his career constructing, the boundary between the nineteenth century and the Roman arena dissolved by the act of making.

In the National Maritime Museum in Haifa, a marble sarcophagus panel from sixteenth-century Italy shows the ancient port of Rome in relief: harbor buildings rising from the waterline, ships under sail and oar working the channel, a colossal Neptune with trident presiding over the scene, an eagle spreading its wings above the central composition, figures on the quayside conducting the business of a working port. The label identifies the subject as the ancient harbor of Rome — Ostia Antica — depicted on a burial monument perhaps fifteen hundred years after the port it celebrates ceased to function. Someone in Renaissance Italy thought the harbor of ancient Rome was worth putting on a coffin. The choice tells you something about how the ancient port’s reputation persisted long after the silt had closed it.

In the National Maritime Museum in Haifa, mounted on a low plinth against a red wall, sits the most significant surviving object from ancient naval warfare: the Atlit Ram, a bronze naval ram recovered by divers off the Israeli coast in 1980, dated to approximately 103–102 BCE, and identified on the basis of its construction and the coins found within it as probably belonging to the fleet of Ptolemy IX Soter II of Egypt. It is roughly 2.3 meters long and weighs over 465 kilograms. It is the only complete ancient naval ram in existence, and looking at it — the three horizontal blades converging at the forward point, the decorated upper surface with its trident and eagle motifs, the massive bronze casting that absorbed decades of seawater and still holds its shape — makes abstract discussions of ancient naval warfare immediately concrete. This is the weapon. Everything else is description.

In the National Maritime Museum in Haifa, a reproduction of a Roman maritime mosaic hangs above a scale model of a Roman grain ship. The mosaic — a copy of the type found decorating the floors of maritime collegia and wealthy houses at Ostia and other Roman port cities — shows the sea as Romans imagined it: dense with fish and marine creatures, alive with the visual abundance that the Mediterranean provided, a merchant vessel moving through a world of tuna, dolphins, an octopus, a whale. The sea in Roman mosaic art is not threatening; it is productive, teeming, the source of food and commerce and the medium through which the empire connected its parts. Below the mosaic, the grain ship model shows the vessel that made this connection real: broad-hulled, square-sailed, designed not for speed but for capacity, the workhorse of the most important supply chain in the ancient world.

In the Cast Courts of the Victoria and Albert Museum in London, two enormous plaster columns rise through the full height of the room, split at the midpoint because no single gallery space in Victorian London was tall enough to accommodate the complete original. Red walls, a cast-iron skylight, medieval tomb effigies on the floor below, the Column of Marcus Aurelius visible behind — it is one of the stranger and more magnificent rooms in any museum in the world, and the centerpiece is a reproduction. The V&A made these casts of Trajan’s Column in the 1860s at the request of Pope Pius IX and Queen Victoria, who both wanted to study the reliefs without traveling to Rome. The decision proved more consequential than either of them anticipated. The original column, standing since 113 AD in Trajan’s Forum in Rome, has weathered continuously for nineteen centuries. The Victorian plaster casts now preserve detail that the stone in Rome has since lost. The reproduction is, in some respects, more legible than the original.

Caesarea Maritima was built by Herod the Great on a site with no natural harbor, no fresh water source, and no existing urban infrastructure, over a period of approximately twelve years ending around 10 BC, and it became the capital of the Roman province of Judaea and one of the most important cities on the eastern Mediterranean coast. The feat of urban creation involved harbor engineering that modern marine archaeologists have called the most ambitious building project in the ancient world: an artificial harbor of roughly 100,000 square meters created by sinking enormous concrete blocks into water sixty meters deep, using hydraulic concrete — the pozzolanic technology that gave Roman harbor structures their extraordinary durability — in its most ambitious application anywhere in the empire. The harbor blocks, two thousand years later, still lie beneath the Mediterranean, structurally recognizable and studied by diving archaeologists who find in them evidence of Roman engineering at its most technically extraordinary.

In the Altes Museum in Berlin there is a circular painted panel, tempera on wood, roughly 30 centimeters in diameter, made in Egypt around 200 AD. It shows a Roman imperial family in full regalia: a bearded emperor in the upper right wearing the jeweled diadem of the Severan dynasty; his wife beside him on the upper left, dark-eyed and elaborately coiffed; a young man below them in the center wearing his own smaller diadem. A fourth face occupies the lower left — or rather, a fourth face should occupy it. What is there instead is bare wood, scratched down to nothing by something sharp, the ghost of a face removed with deliberate force at some point after the panel was painted. The family portrait has three people in it. It was made to have four.

The bust in the Altes Museum in Berlin is one of the more technically striking Roman portrait pieces in any German collection. The head is Carrara marble — white, fine-grained, the standard material for imperial portraiture — but the drapery is carved from a deeply veined breccia, red and brown and amber in layered striations that catch the light differently at every angle. The polychrome combination, fashionable in later reworkings of ancient busts, gives the portrait an unusual visual richness: the cool classical face above the warm geological drama of the clothing. The label identifies her plainly. Kaiserin Faustina die Jüngere. Empress Faustina the Younger. Wife of Marcus Aurelius. Marble, 141–175 AD.