Ice Climbing Up Niagara Falls, Scuba Diving With Orcas, Exploring Mexico's "Snot Caves", Diagnosing the Invisible Impacts of War,

National Geographic Weekend by National Geographic

This week, we dodge humpbacks and killer whales in a feeding frenzy, climb up a frozen Niagara Falls, explore Mexico's poisonous "snot caves", diagnose the invisible injuries of American war veterans, and visit Iraq and...View more