Our Geo Quiz dates back 68 million years, when dinosaurs roamed the southern hemisphere.

The Cal Orck'o dinosaur tracks mark the spot. These fossilized footprints were discovered by chance in 1994 in the Bolivian city of Sucre, the answer to our Quiz.

These dinosaur tracks are among the largest ever discovered. But some locals fear the archaeological site may not be around for much longer. Reporter Ruxandra Guidi sent us this story from Sucre.

A dinosaur replica greets visitors to the cement factory and the Parque Cretacico

About 40 minutes outside of Sucre, there is a large cement factory called Fancesa. And right next door to the factory, is the Parque Cretacico -- or Cretaceous Park -- an open-air museum full of dinosaur replicas and actual dinosaur footprints.

Back in the mid-90s, workers found the dinosaur tracks on the cement factory'S property. Ever since, paleonthologists and cement workers have been going about their business side by side. Juan Carlos Molina is a guide with the Parque Cretacico.

Tourists walk underneath a giant replica

He's showing a group of tourists the enormous limestone wall facing them -- and he's pointing to large footprints along the entire wall.

Molina says this is the longest and most diverse set of fossilized dinosaur tracks in the world. According to scientific studies, the wall was once the bed of a lagoon.

Dinosaurs lived around the shores of this ancient fresh-water lake, which extended beyond modern-day Bolivia, into Peru and Argentina.

Over time, tectonic plate movements pushed part of the lagoon's floor upwards, making it vertical. The wall has been in its upright position for millions of years. But Molina says, it isn't as solid as it seems.

Molina: "This crack that you see on the wall was caused by rainfall. A piece of the wall fell, and that worried us a lot. The wall is in danger, you know, work at the cement factory goes on daily - they even have dynamite explosions and that can damage the dinosaur tracks on the wall."

Back in the city of Sucre is a man who worries about the dinosaur tracks and the condition of the wall they're imprinted on. He's a Bolivian documentary filmaker named Klaus Schutt. He's the man responsible for bringing the tracks at Cal Orck'o to international attention.

Schutt: "I was lucky, because a paleontologist from Switzerland named Dr. Christian Meyer saw a video I made ten years ago on the dinosaur tracks. He was fascinated, and decided to come see the tracks for himself. Soon after that, he realized the importance of these fossils, but he also realized that they were at risk of eventually disappearing."

There are a total of 220 dinosaur tracks at Cal Orck'o, as well as the fossilized remains of turtles, crocodiles and fish from the Cretaceous era. And according to Schutt, there are probably many more treasures sprinkled and hidden throughout the cement factory site. Schutt supports the idea that Cal Orck'o should become one of Bolivia's top tourist attractions.

But he worries that there isn't enough funding available for its research and its preservation.

Schutt: "As soon as I saw the site, I knew it had great tourism potential, so we should be doing more to preserve this place. But given that Bolivia is a poor country with few resources, we should be trying to secure outside funding for research and preservation. Back when we found the tracks, I thought we should have created a foundation."

But 13 years after the discovery at Cal Orck'o, there is still no foundation or team of experts in charge of preserving the site.

Schutt says he is hopeful that someday Cal Orck'o will be recognized as a World Heritage Site.

For The World, I'm Ruxandra Guidi, Sucre, Bolivia.