On Monday, Rome introduced a new entry system to curb previously chaotic tourist flows around the attraction.
A ticket to access the fountain now costs two euros, equivalent to just over 21 kronor. However, most of the square is still open to the public.
According to Rome's tourism director, the entrance fee could bring in at least six million euros, equivalent to over 63 million kronor, per year.
The Trevi Fountain became world-famous when Anita Ekberg bathed there in Federico Fellini's film "La Dolce Vita," and it attracts millions of visitors every year.
There has previously been a restriction limiting visits to a maximum of 400 people at a time.
