A cement quarry near Sucre is home the world’s largest site of dinosaur tracks, known by the locals as Cal Orko.

Morethan 68 million years ago, thousands of dinosaurs flocked at Cal Orko(a lakeside in those times) in search of food and water. This explainsthe over 5,000 dinosaur tracks, laid in around 350 criss-crosstrackways, on a crumbling wall. The most amazing thing about Cal Orkois it features footprints from 330 dinosaur species, from theCretaceous, just before they went extinct.

The fascinating70-degree rockface is a rather new discovery, found by Bolivianworkers, in 1994. It stretches 1.5 kilometers in length and it’s 150meters tall. Compared to other dinosaur track sites, on any othercontinent, Cal Orko is by far the biggest and most important.

Unfortunately,Cal Orko is in constant danger of crumbling and Bolivian authoritiesspend $30 million every year, to keep it in place. With all theirefforts, part of the Dinosaur Wall has crumbled at the beginning ofFebruary, and with it about 300 footprints have been lost.