The world in photos: March 16-22

A young boy squats next to an elder while a group of villagers listens to information given to them at the Enima Evacuation Centre on Tanna Island, Vanuatu, March 19, 2015. More than 100 homeless people live in the evacuation center, with humanitarian aid is still to reach the Island since Cyclone Pam hit the region on March 14. The Vanuatu islands were the hardest hit when Tropical Cyclone cyclone began ripping through the South Pacific. [Photo/IC]

Here's a look at some of the most striking images from major stories around the world in the past week. British Prince William and Kate celebrated St Patrick's Day. First anniversary of Crimea's incorporation into Russia marked. Volcano Villarrica in southern Chile expelled gas and ash into the atmosphere.