The Trevi Fountain is a symphony in stone. But there's a lot more than meets the eye — have you ever wondered what's…

The Trevi Fountain is a symphony in stone. But there's a lot more than meets the eye — have you ever wondered what's behind it? Its hidden details hold the key Rome's power and prosperity... (thread) 🧵

The world's most famous fountain is an enormous shrine to one thing in particular: water. Every year, pilgrims throw a combined €1.5 million into its basin...

At the center is Oceanus, the god of fresh water, flanked by Abundance and Salubrity. Oceanus rides a chariot in the shape of a seashell, drawn by two sea-horses guided by Tritons.

One horse is docile while the other is agitated — symbolizing the alternating moods of rivers and seas. How did Ancient Rome become so great? By taming those waters...

The fountain is full of curious little details, like this false window. The architect, Nicola Salvi, had a dream that his daughter fell through it and died — so he made sure that could never come true.

And he added this sculpture when he grew tired of a nearby barber who kept criticizing his work — to block his barbershop from view.

What's behind is often forgotten: a 17th century palace called the Palazzo Poli. Salvi turned its entire facade into his great symphony. But there's something else far more interesting that people miss: what's underneath...

The fountain was only completed in 1762, but it was built on a site of ancient significance. It's the endpoint of the last of Rome's 11 ancient aqueducts still in operation: the Aqua Virgo.

If you follow the water beneath the fountain you'll find the Vicus Caprarius — the City of Water. It's a first century housing complex, and the water flowing through it (and the Trevi Fountain) still comes from the ancient aqueduct.

Follow it further (red line) and you'll end up 20km outside of Rome at the springs that feed it. This underground aqueduct was dug over 2,000 years ago and still works today.

Rome's aqueducts were the key to its dominance: remarkably simple in concept; brilliant in execution. To bring fresh water right into Rome all you needed was a slight, continuous gradient from source to endpoint — gravity handles the rest.

That meant digging tunnels to cut straight through hillsides and erecting bridges to cross valleys...

Sometimes, it meant building 160 feet into the air. From one end of the Pont du Gard to the other (900 feet), the level descends less than 1 inch. The Roman Empire was built on impeccable precision.

At their peak, these systems fed Rome with a million cubic meters of water per day: to baths, fountains, sewers... Clean water was the civilizational lifeblood that allowed Rome and its population to rise above all others.

At the end of the line, the aqueduct's contribution to human flourishing is marked with a nod to the other great civilizational force that built Rome: Beauty.

P.S. Please can we have a feature to edit typos in the first tweet of a thread? @support Its hidden details hold the key *to* Rome's power and prosperity... 🤦‍♂️