Mount Roraima

Location: Cuyuni-Mazaruni, Guyana / Bolivar, Venezuela / Roraima, Brazil
Coordinates: 5.195 N 60.737 W

This odd-shaped mountain is defended by 400-meters vertical cliffs on all sides, forming a difficult-to-access tabletop. It also marks the triple border among Guyana, Venezuela and Brazil. Geologically speaking, the Mount Roraima is one of the oldest formations on Earth, dating back 2 billion years ago in the Precambrian Era.

Main article:
http://en.wikipedia.org/wiki/Mount_Roraima

Mount Kilimanjaro

Location: Kilimanjaro, Tanzania
Coordinates: 3.065 S 37.359 E

Mount Kilimanjaro is a volcano in northeastern Tanzania, rising nearly 6 kilometers above sea level. This makes it the highest mountain in Africa and one of the Seven Summits. Kilimanjaro consists of three volcanic cones – Kibo, Mawenzi and Shira. The fumaroles on Kibo are evidence that the now-dormant volcano may erupt again.

Main article:
http://en.wikipedia.org/wiki/Mount_Kilimanjaro