Designed by Sir Christopher Wren, St. Paul's Cathedral boasts a beautiful dome which can be seen on the London skyline from miles away. Located north of the River Thames, St. Paul's Cathedral has hosted many high profile religious services and marriages too such as the marriage of Prince Charles to Lady Diana 1981. For any visitor to London, St.Paul's Cathedral, with it's beautifully decorated ceiling, is simply a must on the list of the top ten places to visit.