'Elvis Presley is alive' and 11 more conspiracy theories

9/11

On 11 September 2001, four planes were hijacked by al-Qaeda and two of them were flown into the twin towers of the World Trade Center in New York, killing 2,996 people.

However, some believe that the attack was an inside job, orchestrated in order to cement the US's place as the top global power or to secure the oil reserves in the Middle East.

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Another theory is that the building's owners were responsible for the event (they stood to gain $500m in insurance profits). For more detail, read our feature on the top ten 9/11 conspiracy theories.

Click here to read about moon landing conspiracy theories.