Traces of painted red numbers have been discovered during the ongoing restoration of the Colosseum, indicating various sectors of the amphitheatre similar to the seating system employed by today's stadiums.

The numbers were painted on the arches of the Colosseum to guide visitors to their respective stands, according to their social class. Describing it as an "exceptional discovery", the monument's director Rossella Rea said that restorers had not expected the painted numbers to have survived.

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Source: http://www.wantedinrome.com/