The Colosseum was closed to the public on Wednesday, officials said.
Images showed cars and structures that had fallen 20 meters off the newly formed cliff, while many other homes remain perched perilously on the cliff edge.
Italian fashion legend Valentino Garavani, whose elegant evening gowns were favored for decades by some of the world's most glamorous women, has died at 93, according to his foundation.
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Climate activist Greta Thunberg was temporarily banned from Venice after the Grand Canal was dyed green in an act of protest over the weekend.
Firefighters worked to rescue a worker trapped for hours beneath the rubble of a medieval tower that partially collapsed while under renovation in the heart of Italy's capital on Monday, critically injuring another worker.