NewYork's Ellis Island is filled with the history of the millions of immigrants who passed through its historic buildings. But one famous family, immortalized in a classic film, almost never made it through at all. Deep inside California's Death Valley National Park lies a dried-out lakebed containing a set of mysterious stones which seemingly have the ability to sail across the sand, baffling scientists to this day. And in San Antonio, Texas is a legendary and hallowed fortress which once saw one of America's most famous battles. Some believe that a vast treasure may be buried somewhere within its stone walls.