I would say, unarguably the greatest natural disaster in history was the Cretaceous-Tertiary mass extinction. This was the event responsible for the deaths of countless dinosaurs, plants, and other life 65 million years ago. It was believed to have been caused by an asteroid impact off the coast of the Yucatan peninsula, in Mexico. This impact nearly obliterated all life on earth, pressing a reset button back to single celled life. Thankfully, only 85% of life died and the 15% of the plants and animals that survived were enough to recover (http://park.org/Canada/Museum/extinction/cretmass.html).
A similarly sized asteroid will pass by earth in 2028, it will be close but it is not expected to be a danger.
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