One is in Mexico City and has been found since day one, but has mostly been looted.
One is in the mountains east of Phoenix.
One is on the Colorado River in the Grand Canyon, just above river high water mark. A place that is out-of-bounds for visitors.
One is further up on the Red River near Canyon Lands.
This one is in the southern end of the Panamints on the Western Edge of Death Valley.
The Utes say it is very close to Westgard Pass, that spot marker has been removed by Google. It is probably a few miles north of that point. It is usually found right after heavy rains have was some of the alluvial sands away.There is probably more than one entry point. According to the Walker party back in 1869, they said some of the ruins were found above ground.
Gold Jewels and working technology, along with mummified bodies of some very large humanoids were found by two miners in 1933. Though Death Valley Scotty may have already looted the place dry.
And if you cannot locate it you could jump over to the north end of China Lake Naval Weapons testing center; on a stormy night you can watch them test their weather weapons on the vulcanic hills in the north end of the range.
