C – Colosseum

The Colosseum

Rome's Colosseum is synonymous with the city and it has to be one of the most visited locations.

But these buildings require immense care and 2014 brought to an end a restoration project that cost an estimated £21m.

Although it remained open for the duration, there was inevitably some disruption – especially for the photographers. Two thousand years of pollution had blackened the stonework – and damage caused by the vibration of the nearby metro also required attention. As necessary as all this work is, it is bitterly disappointing for visitors.