Fans looking for the oldest attraction in Disneyland might venture to Sleeping Beauty’s Castle or It’s a Small World. But they’d be wrong. Instead, they should seek out an easily-missed petrified tree in Frontierland. The humble stump is estimated to be anywhere from 55 to 70 million years old. While the tree’s story began long ago, the tale of its journey to Disneyland began in the summer of 1956, when Walt Disney and his wife, Lillian, went on a trip to Colorado to celebrate their 31st wedding anniversary. During their…