Also, I would put Killian Jornet's single day summit of Everest from base camp to summit to base camp without supplemental oxygen solidly in the pantheon of greatest athletic feats of all time. Then he did it again a week later.
I would imagine the Tuscaloosa 2011 supercell that rode all the way in VA before dying, putting down a whole family of tornadoes in the process, might be an example of this.