For hundreds of years, when in Rome, visitors have flocked to the fountain to make a wish, following a storied ritual. Few gave their coins a second thought.
Today, coins pile up for several days before they are fished out and taken to the Rome division of the worldwide Catholic charity Caritas, which counts the bucketfuls of change and uses them to fund a food bank, soup kitchen and welfare projects.
In 2022 Caritas collected 1.4 million euros ($1.52 million) from the fountain and it expects to have gathered even more in 2023. Rome is one of the world's most visited cities with 21 million tourists.
Extracting the coins is a spectacle and involves workers from regional utility ACEA balancing on the edge of the vast Baroque fountain, using long brooms and suction hoses.
The coins are then given to Caritas, where they are dried with hairdryers and cutlery dryers and sorted and counted.
Signs around the fountain explain that the change will go to charity - a thought that pleases many of the tourists posing by the landmark.
"I wanted to make a wish which is dear to my heart," said Yula Cole from Brazil after throwing in a coin. "But I also know that this coin is not just staying there but will help needy people. I made a wish but hopefully this money will help other people's wishes too."
Day and night, throngs of people crowd around the fountain posing for photos. Legend says that if you throw a coin by the right hand over the left shoulder into the fountain, you will return to Rome. People eagerly add their own personal wishes.
"I am tossing a coin as they say if you toss a coin you come back to Rome and also because I want to make the wish to find love," said Carola from Chile.
The Trevi Fountain, completed in 1762, covers one side of Palazzo Poli in central Rome with its statues of Tritons guiding the shell chariot of the god Oceanus, illustrating the theme of the taming of the waters.
It is where Italian film director Federico Fellini set one of the most famous scenes in cinema in "La Dolce Vita", with Anita Ekberg wading into the fountain after midnight and beckoning Marcello Mastroianni to join her.
Wading into its waters today is forbidden and tourists face fines if they do.
COIN SORTING
Twice a week, up to four workers collect the coins, said Francesco Prisco, a manager at ACEA. The fountain is drained for cleaning twice a month.
"The collection and cleaning operations are carried out as quickly as possible to try to reduce the downtime of the fountain," he said.
After the coins have been swept into a long line by a long-reach broom, they are sucked up by hoses and taken to Caritas' office, where employee Fabrizio Marchioni spreads them across a huge table for drying.
Not just coins are fished from the fountain. Workers have removed jewellery, dentures, religious medals, even umbilical cords.
Signs by the fountain warn not to steal the coins.
Over the decades the coins have been targeted, sometimes with magnets attached to a pole.
Close to Rome's main station is Caritas' supermarket, known as the Emporium, which allocates food to needy residents who can purchase it with tokens on a card.
"I was a blacksmith but then I lost my position and my arthritis does not help in finding a new job. Luckily there are places like this Emporium," said a man who gave his name only as Domenico.
Another man, Luigi, explained: "I was a builder and also the owner of a video surveillance system company before I lost my job. Places like this Emporium give concrete help."
Back at the fountain, the coins stack up.
"I got told that if I toss in two coins my wishes will come true. So that's why I did it," said Chinese tourist Yuting.
