4 / 14
Britain's Kate, Duchess of Cambridge, accompanies Queen Elizabeth II and Prince Philip, not pictured, arrives at Baker Street underground station in London for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. (AP Photo/Sang Tan)

British royals tour the London Underground

The Queen in a public tube station? No, you're not imagining things. Britain's Queen Elizabeth II, along with Catherine, Duchess of Cambridge, paid a royal visit to the Baker Street Underground station in London on Mar. 20 to mark the 150th anniversary of the London Underground.