Where was Charles I executed?

Charles I was executed at Whitehall on January 30, 1649. This location is significant in British history as it marks the end of the monarchy during that period and the establishment of the Commonwealth under Oliver Cromwell. Whitehall was chosen for the execution due to its proximity to the royal palaces and its central location in London, making it a public declaration of the King's trial and execution by Parliament.

The other locations mentioned are historically important but do not relate to Charles I's execution. Trafalgar Square, known for its monuments and public gatherings, did not exist in its current form during the time of Charles I. Hampton Court is famous for its royal palace and gardens but was not the site of the execution. Greenwich, known for its maritime history and the Greenwich Meridian, does not have a connection to this pivotal event in English history.