Palace of westminster

The Palace of Westminster, also known as the Houses of Parliament or Westminster Palace, in London, England is where the two Houses of the Parliament of the United Kingdom (the House of Lords and the House of Commons) meet to conduct their business. The Palace lies on the north bank of the River Thames in the London borough of the City of Westminster, close by other government buildings in Whitehall.

The oldest part of the Palace still in existence, Westminster Hall, dates from 1097. The palace originally served as a royal residence but no monarch has lived in it since the 16th century. Most of the present structure dates from the 19th century, when the Palace was rebuilt after it was almost entirely destroyed by a fire in 1834. The architect responsible for rebuilding the Palace was Sir Charles Barry with Augustus Welby Pugin. The building is an example of Gothic revival. One of the Palace's most famous features is the clock tower, a tourist attraction that houses the famous bell Big Ben.

The Palace contains over 1,000 rooms, the most important of which are the Chambers of the House of Lords and of the House of Commons. The Palace also includes committee rooms, libraries, lobbies, dining-rooms, bars and gymnasiums. It is the site of important state ceremonies, most notably is the State Opening of Parliament. The Palace is very closely associated with the two Houses, as shown by the use of the word ‘Westminster’ to refer to ‘Parliament’. The Palace of Westminster was strategically important during the Middle Ages, as it was located on the banks of the River Thames. Buildings have occupied the site since at least Saxon times. The Palace of Westminster was the monarch's principal residence in the late Medieval period. The predecessor of Parliament, the Curia Regis (Royal Council), met in Westminster Hall. The Model Parliament, the first official Parliament of England, met in the Palace in 1295. Since then, almost all Parliaments have met in the Palace. However, some Parliaments have met in other locations.

The Palace of Westminster includes approximately 1,100 rooms, 100 staircases, and 3 miles (5 km) of passageways. The building includes four floors; the ground floor includes offices, dining rooms, and bars. The 'first floor' (known as the principal floor) houses the main rooms of the Palace, including the Chambers, the lobbies, and the libraries. The Robing Room, the Royal Gallery, the Prince's Chamber, the Lords' Chamber, the Peers' Lobby, the Central Lobby, the Members' Lobby, and the Commons' Chamber all lie in a straight line on this floor.

The top two floors are used for committee rooms and offices.

The exterior of the Palace of Westminster — especially the Clock Tower — is one of the most visited tourist attractions in London. The United Nations Educational, Scientific and Cultural Organization (UNESCO) classifies the Palace of Westminster along with neighbouring Westminster Abbey and St. Margaret's as a World Heritage Site. It is also a Grade I listed building.