Thanks to the power of the web and live broadcasts on television, the conspiracy theories surrounding the events of 9/11 - when terrorists attacked the World Trade Centre in New York and the Pentagon in Washington - have surpassed those of Roswell and JFK in traction.Despite repeated claims by al-Qaeda that it planned, organised and orchestrated the attacks, several official and unofficial investigations into the collapse of the Twin Towers which concluded that structural failure was responsible and footage of the events themselves, the conspiracy theories continue to grow in strength.In recent years, witnesses have added significant new details, including claims of a large military operation dedicated to recovering alien craft and aliens themselves, at as many as 11 crash sites, and alleged witness intimidation.

However, later studies, including one by the National Academy of Sciences, have called into question the accuracy of the evidence used by the HSCA to support its finding of four shots.

The event that kick-started more than a half century of conspiracy theories surrounding unidentified flying objects (UFOs).

Many believed that several shots were fired by gunmen hiding behind a picket fence on a grassy knoll overlooking the plaza.

The assassination is still the subject of widespread speculation and has spawned numerous conspiracy theories, though none of these has been proven.

In 1979, the House Select Committee on Assassinations (HSCA) found both the original FBI investigation and the Warren Commission Report to be seriously flawed.

The HSCA also concluded that there were at least four shots fired and that it was probable that a conspiracy existed.The conspiracy theory has been fanned by the US military repeatedly changing its story.Within hours of the army telling reporters that it had recovered a crashed saucer, senior officers insisted that the only thing that had fallen from the sky had been a weather balloon.Haut says in the affidavit -signed in 2002 - that he saw alien corpses and a craft and that he had been involved in a military cover up. People who think that the Apollo moon landings were not all that they seemed at the time believe that Nasa faked some or all of the landings.Some of the theories surrounding this subject are that the Apollo astronauts did not land on the Moon; Nasa and possibly others intentionally deceived the public into believing the landings did occur by manufacturing, destroying, or tampering with evidence, including photos, telemetry tapes, transmissions, and rock samples; and that Nasa and possibly others continue to actively participate in the conspiracy to this day.A conspiracy in which powerful and secretive groups (the Illuminati, the Bilderberg Group and other shadowy cabals) are plotting to rule mankind with a single world government.