Natural and Archeological Treasures Revealed due to Drought (2:20)

<STYLE>P{margin-top:2px;margin-bottom:2px;}</STYLE> Natural and Archeological Treasures Revealed due to Drought  (2:20) Well, it's certainly a magnificent picture out there in the west.   Finally tonight, the drought that has caused so much suffering out west has also done rather amazing. It has uncovered a natural wonder that had been hidden for decades. ABC's Judy Muller reports from Lake Powell in Utah.   Lake Powell, one of the mightiest reservoirs in the west has lost more than 60% of its water to the worst drought in 500 years. But conservationists are thrilled.   "It covered one of the most incredible places on earth. Truly, one of the most spectacular regions."   For the first time, since the Colorado River was dammed in the 1960s, inundating 186 miles, Grand Canyon is making a comeback. Far below that high water mark on the cliffs, visitors can now see long-hidden rock formations, Indian ruins, sinuous side canyons. And now, Grand Canyon's most famous feature has emerged from the depth. An enormous cavern, called the Cathedral Of The Desert.   "It is absolutely overwhelming. I could not believe in my wildest dreams we will ever see this place. Because this is almost mythical."   A narrow swat at the top of the chamber sends a shaft of light into the cathedral-like space. A pristine waterfall serves as a natural altar. Only a handful of people have been here.   Just five years ago, this cavern was under 140 feet of water. People who boated into the canyon had no idea what wonders lay beneath them.   Riche Angebeth, a Salt Lake City physician founded the Grand Canyon Institute to lobby for the restoration of this area. That would mean an end to Lake Powell.   "You have to store water. That's absolutely correct for times of drought and fluctuating river flows. But you don't have to store water in our beautiful places."   His group argues that there is plenty of storage room for Colorado river water in Lake Mead below the Grand Canyon. But the government says both lakes are needed.   "We have only been able to withstand five years of such severe drought in the west because we had water stored in Lake Powell and in Lake Mead."   But even as people debate the issue, nature may have the last word. For now, at least, it is providing a tantalizing preview. Juddy Muller, ABC News, Lake Powell, Utah.