1906 - Mount Vesuvius
When Mount Eyjafjallajokull in Iceland erupted earlier this year, it caused massive disruptions in European air travel, which in turn caused delays and alterations of sporting events across the continent. But it was not the first volcanic activity to greatly affect the sporting world, nor did it have the largest impact.
Rome was originally selected to host the 1908 Summer Olympics, but in 1906 Mount Vesuvius erupted, devastating the city of Naples. The Italian government had no choice but to divert funds from preparing for the Rome Olympics to repair Naples and its surrounding areas. As a result, the Games were moved to London. Despite short notice, the British Empire was still able to complete the contruction of White City Stadium in time for the Olympics, which was considered a technological marvel at the time. Rome would finally get its turn to host the Games in 1960.