A fact from St. Michael's Cave appeared on Wikipedia's Main Page in the Did you know column on 8 September 2008, and was viewed approximately 5,223 times (disclaimer) (check views). The text of the entry was as follows:
Did you know... that Gibraltar's St. Michael's Cave, prepared as an emergency hospital during World War II, at present contains an auditorium and receives almost a million visitors a year?
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I have removed the costasur.com reference. It's a web-page; the author is not identified; it seems to be run by perhaps a travel firm; and it looks *really* tacky. It was used to support an "according to experts" assertion in the article. A citation that is used to support an "according to experts" assertion should either be by those very experts, or it should tell you where to find them making the required supporting statements. This did neither - it was just a webpage containing the same "according to experts" assertion.