Built over six centuries, Florence’s cathedral or Duomo is famous above all for Brunelleschi’s huge 15th-century terracotta-tiled cupola, still the biggest masonry dome in the world.

During Nardella’s tenure he introduced a series of bans and regulations to limit numbers of visitors, making Florence the first Italian city to crack down on overtourism.

Florence, Italy, 2010 Robert Polidori's photographs of the frescos of Fra Angelico in the 15th Century Dominican priory of San Marco, in Florence, Italy, are on show for the first time in the UK.