Prince Charles takes the Tube in London

Members of the Royal Family rarely have to "mind the gap."

But on Wednesday, Prince Charles and his wife, Camilla, took a rare ride on the Tube to mark the 150th anniversary of the London Underground.

The last time Prince Charles ventured on to the subway was in 1986 when the late Princess Diana traveled to Heathrow Airport to open a new terminal, the Associated Press reported.  

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