For curious kids, this is the chance to embark on the journey of a lifetime - and see how faraway countries have more in common than you might expect! Hopscotch from country to country in a chain of connecting attractions: Explore Mexico's glittering cave of crystals, then visit the world's largest cave in Vietnam. Peer over a 355-foot waterfall in Zambia, then learn how Antarctica's Blood Falls got their mysterious color. Or see mysterious mummies in Japan and France, then majestic ice caves in both Argentina and Austria.