For U.S. Visitors to the U.K.
Big Ben: Tours of the Clock Tower
Tours of the Clock Tower at the United Kingdom Parliament, known as Big Ben, are managed by the Parliamentary Works Services Directorate, however, for security reasons tours for overseas visitors are currently not permitted. This also includes visitors from the United States.
For further information please see the UK Parliament website which also offers a virtual tour.
Information on other London tourist attractions can be found on the VisitBritain website or contact:
VisitBritain
Britain and London Visitor Centre (BLVC)
1 Regent
St
Piccadilly Circus
London W1