Here are some information about the things which have been lost long time ago, but now are starting to appear....

(1) The White City of Gold
From  White City of Gold  6/3/2013
According to legend, The legend of El Dorado and the "Lost City of Gold" has obsessed historians and explorers for almost five hundred years. "Ciudad Blanca" or the "White City" is full of gold and has been sought out by explorers and treasure hunters since conquistador Hernando Cortes first made reference to it in a 1526 letter to King Charles V of Spain. Texts cite it as the birthplace of the Aztec god Quetzalcoatl and previous reported sightings over the years have described golden idols and elaborately carved white stones, leading to the lost city's name. However, no confirmation of the existence of the city has ever been provided.

We may never be able to tell whether any of these are Ciudad Blanca, or whether the legendary city ever existed, but we can clearly see in the UTL data evidence that there was a densely settled region with a human modified environment. These conclusions provide important new insights into the pre-Hispanic settlement of this largely unexplored region. Text's cite it as the birthplace of the Aztec god Quetzalcoatl and previous reported sightings over the years have described golden idols and elaborately carved white stones, leading to the lost city's name.

10,000 Years Old Mammoth Frozen Blood Found: Cloning Planed
From   Mammoth Blood   6/3/2013
It’s not April Fool’s, is it? Scientists working on an island in Siberia have announced that they found a frozen woolly mammoth carcass estimated to be at least 10,000 years old and, more shockingly, liquid mammoth blood. The finding seems to defy reason, because conditions in the Lyakhovsky Islands, off the northern coast of Siberia, were quite cold - in the low teens Fahrenheit. But when one of the researchers poked at the carcass with an ice axe, blood squirted out. “It can be assumed that the blood of mammoths had some cryo-protective properties,” said Semyon Grigoriev, chairman of the university’s Museum of Mammoths and head of the expedition. “The blood is very dark, it was found in ice cavities below the belly and when we broke these cavities with a pick, the blood came running out.” The Russians are calling the female, who was 50 to 60 years old when she died, the best preserved mammoth specimen in the history of paleontology. Their theory is that she fell into water, died, and was protected when it froze.