The Princess Royal will officially open Bradford Royal Infirmary's new £28m wing and concourse later.
Princess Anne will tour a new children's ward, a dementia-friendly area and a state-of-the-art intensive care unit.
Doctor Simon Frazer is a consultant pediatrician who's worked on the expansion for the last 7-years.
He says he's delighted with the new facilities:
Princess Anne will also officially open the bars, restaurants and shops at Sunbridge Wells in Bradford.
The network of Victorian tunnels opened to the public last year, after going through a £2m transformation.