Top 10 Most Spectacular Pits in the World: Hell's Gate Ranked First (Picture Group)
by shfengyi on 2008-09-26 16:16:29
According to foreign media reports, when human beings mine ores, they often dig very huge mine caves. In addition, nature sometimes forms amazing and spectacular caves. The following are the most spectacular natural or man-made caves on the earth's surface listed by American media.