The reason Piazza Navona is shaped like a long oval is because it IS a racetrack. In 86 AD, Emperor Domitian built a stadium here — the Stadium of Domitian — seating 30,000 spectators for Greek-style athletic competitions (running, wrestling, javelin — not the gladiator fights of the Colosseum). The piazza's shape is the exact outline of the original racetrack. The buildings along the edges stand on the stadium's foundations. The underground level (accessible for €8 at Via di Tor Sanguigna 3) shows the original stone arches of the stadium — you walk where 30,000 Romans once screamed. 1,900 years later, the racetrack became Bernini's greatest public stage.
Plan my Navona visit →Domitian's Stadium was built for the Certamen Capitolinum Iovis — athletic competitions in the Greek tradition (Domitian admired Greek culture). The track was 275m long, 106m wide, with a curved north end (still visible in the piazza's shape). Capacity: 30,000. It was the only permanent stone stadium in Rome built exclusively for athletics (not gladiators). The name "Navona" comes from "in agone" (in competition) → "nagona" → "navona." After the Empire fell: the stadium was abandoned, buildings grew on top of it using the arches as foundations, and the sunken arena floor became a public square — the lowest point in the neighborhood, which is why Navona floods slightly during heavy rain (it's a bowl).
In 1644, Giambattista Pamphilj became Pope Innocent X. His family palazzo (Palazzo Pamphilj, now the Brazilian Embassy) faced Piazza Navona. He decided to transform the piazza into a showcase of Pamphilj power — commissioning the church of Sant'Agnese in Agone (Borromini), the Fontana dei Quattro Fiumi (Bernini), and the two smaller fountains at each end. The piazza as you see it today is essentially one family's vanity project — the most spectacular vanity project in the history of urban design.
The central fountain represents 4 great rivers of the 4 known continents: Nile (Africa — head covered because its source was unknown), Ganges (Asia — holding an oar), Danube (Europe — touching the Pamphilj coat of arms), and Río de la Plata (Americas — recoiling as if in awe). An Egyptian obelisk (1st century AD, originally from Domitian's Circus of Maxentius on the Appian Way) rises 16.5m from the center of the rock formation. The engineering: the rock is hollow — you can see THROUGH the base from certain angles, making the massive obelisk appear to float on air. Bernini designed it as theatre: the water, the rock, the rivers, the obelisk — every element works together as a single dramatic scene. It IS a stage set in stone.
The most famous art legend in Rome: Bernini's Rio de la Plata figure raises his hand as if shielding his eyes from Borromini's Sant'Agnese in Agone church across the piazza — implying the church is so ugly he can't look at it. The Nile's covered head supposedly makes the same insult. The legend is FALSE — the fountain was completed in 1651, two years before Borromini began the church facade (1653). Bernini couldn't have been mocking a building that didn't exist yet. But the legend captures something real: Bernini and Borromini genuinely despised each other, competed for every papal commission, and their rivalry produced the two greatest Baroque works in Rome — facing each other across this piazza for eternity. Baroque walk →
Morning (8-10am): Nearly empty. The fountain sounds amplified by silence. Best time for photography. Day (11am-6pm): Street artists, musicians, painters selling overpriced art, tourists. Alive but crowded. Evening (7-10pm): Aperitivo at the surrounding bars (€10-16 Spritz). The piazza becomes Rome's outdoor living room. Night (11pm+): The crowd thins. The fountain glows underwater. The most atmospheric piazza in nocturnal Rome. Christmas (December): The Navona Christmas market — nativity stalls, befana toys, roasted chestnuts, torrone. Through January 6 (Epiphany). Christmas guide →