Mount Roriama is an amazing mountain that is on the border of Venezuela, Brazil and Guyana. It is surrounded on all sides by 400 meter tall cliffs. Atop the cliffs the summit is bare sandstone with only a few shrubs and small marshes (most of the nutrients are washed away in the daily rains).
The mountain was first “discovered” in 1596 by Sir Walter Raleigh (although the natives of the area knew about it long before). Mount Roraima inspired Arthur Conan Doyle’s The Lost World and more recently, Pixer’s Up movie.