A huge volcano erupted violently about 760,000 years ago on the eastern side of the Sierra Nevada, forming a large depression called the Long Valley Caldera. This “super-eruption” was estimated to be more than 2,000 times larger than the 1980 eruption of Mt St Helens...Today, the Mammoth Lakes resort area is on the western edge of the ancient caldera.
Hundreds of years before the Inca Empire rose to fame and glory, the Tiwanaku culture flourished in cold and thin air in the Andes Mountains....Collecting and transporting heavy stone blocks from distant quarries were among the many impressive accomplishments of the Tiwanaku people.
In the Andes Mountains of South America, the Incas and their ancestors invested enormous amounts of time and labor in the meticulous work of quarrying, transporting, and fitting together multi-ton stone blocks, or megaliths, for monumental construction projects..... The ancient Andean stonework is so impressive that many have found it difficult to believe that mere humans, who lacked draft animals and were using only stone-age tools, could be responsible for the construction.