
Westminster Hall is the oldest hall of the Houses of Parliament. Dating all the way back to 1097, it stands today as one of Europe’s largest unsupported medieval halls
It became the primary residence of the Kings of England until fire demolished the royal apartments in 1512, the Palace of Whitehall was opened. The remainder of Westminster continued to serve as the home of the Parliament of England, which had met there since the 13th century, and also as the seat of the Royal Courts of Justice, based in and around Westminster Hall.
In 1834 an even greater fire ravaged the heavily rebuilt Houses of Parliament, and the medieval structures that remain were Westminster Hall, the Cloisters of St Stephen's, the Chapel of St Mary Undercroft, and the Jewel Tower.
The Palace of Westminster is goverment body of two parliamentary houses of the United Kingdom - The House of Lords and the House of Commons.