Mt. Everest is the tallest mountain in the world. FactsIP FactoidsSubjectsPlace-FactsRecord Breaking Facts by IP Factly - May 5, 2015 Image credit: ilkerender cc2.0 Mt. Everest has a height of roughly 29,028 feet above sea level – about the size of 10 Burj Khalifas. About 4,000 have tried to climb to its summit, from which Tibet, India and Nepal can all be seen, but only 600 have been successful so far.