They aren't necessarily. The Abbey's own website states:
'Westminster Abbey has hosted only sixteen royal weddings in its long history (of reigning monarchs or those who, had it been established at the time, were entitled to the style "Royal Highness"). History records a number of weddings taking place "at Westminster" but his did not necessarily mean at the Abbey. Another probable venue was St Stephen's chapel in the Palace of Westminster. Whitehall Palace and Greenwich Palace were two of the locations used by Henry VIII. St James's Palace and St George's chapel Windsor were also popular with later monarchs and their children. Princess Patricia, a grand-daughter of Queen Victoria, began the modern trend for royal marriages at Westminster Abbey in 1919 and Princess Mary and Elizabeth Bowes Lyon, who married the future George VI, chose to follow her example.' However, in more recent history:
Several Royal Weddings have been held elsewhere. The Duke and Duchess of Kent were married in York Minster; Prince Charles and Princess Diana were married in St. Paul's Cathedral; the Queen's youngest son Prince Edward and his wife Sophie were married in St. George's Chapel Windsor; and for his second wedding to Camilla, Prince Charles married in the Guildhall, Windsor, followed by a Service of Blessing in St. George's Chapel. Of the Queen's grandchildren, only Prince William was married in Westminster Abbey. Peter Phillips and his wife Autumn were married in St. George's Chapel, Windsor, and his sister, Zara Phillips, married Mike Tindall in the Cannongate Kirk, Edinburgh.
There are 3000+ people buried in Westminster Abbey.
Westminster Abbey
Harold Godwinson
Newton, Herschel, Darwin, Rutherford, Thomson, Kelvin, P.A.M. Dirac
It is famous for marrying all the royals, such as the recent Kate Middleton and Prince William.
Lawrence Edward Tanner has written: 'Unknown Westminster Abbey' -- subject(s): Westminster Abbey 'Westminster School' -- subject(s): Westminster School 'The history of the coronation' 'The abbot's house and deanery of Westminster Abbey' 'The history and treasures of Westminster Abbey' -- subject(s): Westminster Abbey 'Westminster Abbey'
Westminster Abbey is High Anglican
Because it's an abbey and it used to be in the City of Westminster which is now within London.
The Coronation of Queen Elizabeth II was held in the Abbey Church of St. Peter, Westminster (Westminster Abbey) on 2nd June 1953
They are in the grounds of the Abbey.
Westminster Abbey
Westminster Abbey, is an Anglican, Christian Church.
Herbert Francis Westlake has written: 'The story of Westminster Abbey' -- subject(s): Westminster Abbey 'The new guide to Westminster Abbey' -- subject(s): Westminster Abbey
Westminster Abbey
Westminster Abbey
In London's Westminster Abbey. In 1953.Westminster Abbey
Westminster Abbey is in London which is in southeast England.