A replica of the Palmyra Arch is currently on display in the Piazza della Signoria, bringing awareness to the senseless destruction of the original in Syria in 2015 by militants. It is an austere and chilling juxtaposition, this lost arch and Florence, which is lavished with attention.
For more information, see the following sources:
http://www.florencedailynews.com/2017/03/14/replica-palmyras-arch-unveiled-g7-florence/
