British royals visited a subway station and a zoo among events this week.
Britain's Kate, the Duchess of Cambridge, watches as Britain's Queen Elizabeth II unveils a plaque at Baker Street underground station in London, during a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. The Queen made her first public engagement in more than a week Wednesday after cancellations following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)