The images provoked over 900 comments on the post, many expressing fury and calling for legal action.
“If I s*** on the lap of the Lincoln Memorial statue, they’d give me the electric chair,” one person commented.
“This is the result of years of trying to turn Florence into Disney World,” wrote another.
Superintendent Antonella Rinaldi told the BBC: “Tourists are welcome here but they need to respect our artworks, be they originals or replicas”.
She added: “Although I doubt this lady - whom I condemn - even knows the difference”.
The incident is the latest in a long line of tourists’ bad behaviour in Europe - and locals are getting fed up.
Two weeks ago, Barcelona locals sprayed travellers with water guns and trapped them inside restaurants while chanting “tourists go home”.
On July 9, Barcelona’s mayor Jaume Collboni reiterated several measures were under way to reduce mass tourism’s impact on the city.
In July 2022, Italy announced a series of actions they wanted tourists to stop doing - or face fines. For example, sitting on Rome’s Spanish Steps could cost you a fine of €400 ($719).