The World's Tallest Mountain

At 29,029ft (8,848m) Everest is the uppermost mountain in the world, but measured from top to bottom, under sea level, Mauna Kea beats Everest by 4436 ft. (over 3/4 of a mile).

Although Mount Everest, at 29,029 feet high, is often called the tallest mountain; Mauna Kea, an inactive volcano on the island of Hawaii is in fact taller. Only 13,796 feet of Mauna Kea stands on top of sea level, however, if you measure it from its base, which is under sea level, it is 33,465 feet. If you stand Mauna Kea and Mount Everest next to every other, Mount Kea would be 4400 feet taller