The Vatican honours the celebrated Spanish architect, structural engineer, sculptor and painter Santiago Calatrava with a major exhibition at the Braccio di Carlo Magno, to the left of St Peter’s Square.

Entitled Le Metamorfosi dello spazio, the exhibition features models of Calatrava's signature projects as well as his geometric portrait paintings, watercolours and sketch books.

Among the highlights of the 140 works on show are Calatrava’s models for the St Nicholas Greek Orthodox Church at New York's Ground Zero site, and the Cathedral of St John the Divine, also in New York.

Significantly, it is first time that the Vatican honours a living architect with an exhibition.