Located on the border between Nepal and Tibet, Everest is the world's highest mountain and most notorious.

It is also one of Nepal's most significant sources of tourist revenue. Almost 2,500 reached Everest's summit by the end of 2007, each bringing in around $25,000 each. Sherpas are an ethnic Nepalese group who reside in the mountains and are employed as guides and porters for climbers.

Two of the most famous climbers in the world are Edmund Hillary (a New Zealander) and Tenzing Norgay (a Sherpa), the first men to reach the summit of Everest in 1953

The highest mountain in the world outside Asia, Aconcagua is located in the Mendoza province of Argentina, famous for its Malbec wine.

Aconcagua is said to be an easier mountain to climb, technically speaking. Altitude sickness is one of the biggest barriers and no oxygen masks are required.

Denali is the Native American word for "The High One." It was once named Mount McKinley after U.S. President William McKinley but named back in 1980.

Mount Denali is known for its cold climates, containing 5 large glaciers. One thermometer that was left on the mountain for over 19 years recorded that it had once reached -73.3C (-100F). Severe altitude sickness is also prevalent on Denali because its latitude is much higher. A mountain like Denali at the equater would have approximately 47% more oxygen on its summit, compared to sea level.

Kilimanjaro is made up of three cones of an inactive volcano and is the highest peak in Africa. Kibo is the highest cone where Uhuru Peak stands over Tanzania.

The Elbrus mountain is also known as Strobilus, where Zeus chained Prometheus and Titan stole fire from the gods to give to men.

Each summer, approximately 100 climbers attempt the climb each day. Every year, about 15-30 die from their attempts to summit the mountain.

Vinson is known as one of the most inaccessible ranges in the world, and is only 800 miles from the South Pole.

The mountain was unknown and unsuspected until 1957. It wasn't until 1966 and 1967 that the first ascent was made to its peak. The most difficult part about the Vinson Massif is its inaccessibility, but there are now a few operators who offer tours to this no man's land.

Puncak Jaya is known as the most technically difficult summit to climb. To climb to the peak of Puncak Jaya, a government permit is required but can be acquired through adventure tourism operators.