Colosseum on fire

[Epictetus]

This looks remarkable. According to the BBC:

A giant video installation at Rome's Colosseum was used to create the impression that the ancient ampitheatre was on fire.

The installation was designed to shock people into taking better care of their cultural heritage. Organisers said that at least 100,000 people observed the illusion.

BBC video

Edit: And I found a still image on Flickr.