You have probably seen St. Paul's Cathedral at least once ... on the television, in the news, or as the backdrop of a movie. Remember the woman who would "Feed the Birds" in the movie, "Mary Poppins"?

Architect Christopher Wren designed this Anglican Cathedral as London rebuilt after the Great Fire of 1666. At that time, King Charles II commanded that all new houses be made of stone and brick rather than wood. Londoners needed structures that would last. This church was actually the fourth to be built on the site, and the one with the most staying power.

Just building the Cathedral took 42 years, until 1711. It is based on the form of medieval churches, with two western towers, a long nave, and a central crossing above which rises a tower -- the dome.

The Cathedral's dome is the second largest in the world, at 366 feet, or 111.56 meters, in height. Until 1962, it was the tallest building in London. St. Paul's Cathedral can hold 3,500 guests. It was large enough for Winston Churchill's funeral in 1965. It was grand enough for the wedding of Prince Charles and Lady Diana in 1981, after which it became one of the most popular churches to visit in England.