The cannonball appears to date back to 1836 and may have been fired by the Mexican Army during the historic Battle of the Alamo.
The Who concert disaster took place in December 1979 in Cincinnati, Ohio, when a crowd surge before the show killed 11 fans.
They've currently found a minimum of 227 children, who were likely sacrificed as a ritualistic offering to appease the Chimú's moon god in hopes of better weather.
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