Mount Everest is indeed the world's highest mountain, with its peak standing at 8,849m (that's 8.8km) above the ocean. However, if you consider mountains that begin below sea level, Everest is not the ...

an inactive shield volcano on the island of Hawaii, would instead come out on top. But there is one more contender for highest mountain: Mount Chimborazo, an inactive stratovolcano in the ...