Britain's Catherine, Duchess of Cambridge, (R) and Britain's Prince William, Duke of Cambridge, (L) visit the under-construction Northern Spire Bridge across the River Wear in Sunderland on February 21, 2018. The Duke and Duchess of Cambridge visited Sunderland to learn about the city's arts scene and engineering talent. Construction began on the three span cable-stayed structure bridge over the River Wear in Sunderland in May 2015. / AFP PHOTO / POOL / Danny Lawson