Take a look at the most famous conspiracies across the world:

John F. Kennedy

Lee Harvey Oswald was charged with killing him, and a presidential commission headed by Chief Justice Earl Warren found that Oswald acted alone. A 2003 ABC News poll found that 70% of Americans believe Kennedy's death was the result of a broader plot. The trajectory of the bullets, some say, didn't square with Oswald's perch on the sixth floor of the Texas School Book Depository.

Illuminati

The Order of the Illuminati was an Enlightenment-age secret society founded by university professor Adam Weishaupt on May 1, 1776, in Upper Bavaria, Germany. The movement consisted of advocates of freethought, secularism, liberalism, republicanism, and gender equality, recruited from the German Masonic Lodges, who sought to teach rationalism through mystery schools.

Fake Moon Landing

Moon landing conspiracy theories claim that some or all elements of the Apollo program and the associated Moon landings were hoaxes staged by NASA, possibly with the aid of other organizations. The most notable claim is that the six crewed landings (1969–72) were faked and that 12 Apollo astronauts did not actually walk on the Moon.

Chemtrails

The chemtrail conspiracy theory is based on the belief that long-lasting condensation trails are "chemtrails" consisting of chemical or biological agents left in the sky by high-flying aircraft, sprayed for nefarious purposes, and undisclosed to the general public. Believers in this conspiracy theory say that while normal contrails dissipate relatively quickly, contrails that linger must contain additional substances. Those who subscribe to the theory speculate that the purpose of the chemical release may be solar radiation management, weather modification, psychological manipulation, human population control, or biological or chemical warfare, and that the trails are causing respiratory illnesses and other health problems.