This L shaped tower dates from 1365 and is the only original part of Westminster to survive. It was principally King Edward III's 14th Century home. The tower was built as the King's personal jewel house and treasury. When Westminster ceased to be a Royal palace the tower became an archive for parliamentary papers. The Offices for Standard Weights and Measures are also displayed in the upper chamber. In the lower chamber the original ancient foundations of the previous Westminster can be seen. Admission fees apply.