The tepui of Venezuela and Guyana contain some of the tallest cliffs on the planet, some up to 1000 meters (3200 feet) high. You're only seeing about 2/3rds of the full cliff in this photo. They're really quite astonishing. And scary.
Here, I pose near the edge of one.
Location: Mt. Roraima, Venezuela
Lens used: 28-135mm f3.5-5.6 IS