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El Dorado, the legendary city covered in gold, doesn't seem like a place that could really

exist, but then neither did to Puyis. And the Guy on Highlands, a remote region of South

American rainforest, flat mountains with vertical walls rise high above the forest canopy,

poking into the clouds. These mountains are known as Tupuyis, and they're ringed by giant

waterfalls which shoot out from their sides. In 1595, while on a quest to find El Dorado,

English explorer Sir Walter Raleh was probably the first European to see it Tupuy, off in

the distance. He heard rumors that it was a mountain of crystal, but he had to turn

back before reaching the mountain because the rainy season had started, and his group

was running low on supplies. Even today, getting to the base of it Tupuyis is an enormous

undertaking. When you're in a cloud forest, it's often completely quiet. Just no sound at

all. So you look around, it's misty. You don't hear a thing, but a lot of people think

that's eerie. Bruce means is a biologist who's been studying ecosystems like this for

more than 35 years. It causes me to do what I'm doing to shut up. And just listen to the

silence. And at night at a hammock, when it's cloudy, and there's no moon, it's completely

dark. It's pretty wonderful. Then it starts raining, and the rain comes down. Just like

all of the rain in the tropics can come down like somebody pouring bucket on a tin

...